2304-9782, 2618-8686, 2405-7223
St. Petersburg Polytechnic University Journal: Physics and Mathematics
16
1.1
2023
1-498
CNF
RUS
9-15
Bunin Yelets State University
Rodionov
Arkadi
arkadijfirst3@gmail.com
Yelets, Russian Federation
Herzen State Pedagogical University of Russia
Kolobov
Aleksandr
akolobov@herzen.spb.ru
St. Petersburg, Russian Federation
Herzen State Pedagogical University of Russia
Gerega
Vasilisa
gerega.vasilisa96@gmail.com
St. Petersburg, Russian Federation
Herzen State Pedagogical University of Russia
Suslov
Anton
a.v_suslov@mail.ru
St. Petersburg, Russian Federation
Herzen State Pedagogical University of Russia
Komarov
Vladimir
va-komar@yandex.ru
St. Petersburg, Russian Federation
Herzen State Pedagogical University of Russia
Grabov
Vladimir
vmgrabov@yandex.ru
St. Petersburg, Russian Federation
Herzen State Pedagogical University of Russia
Demidov
Evgenii
demidov_evg@mail.ru
St. Petersburg, Russian Federation
Stepanov
Roman
frid.rom.serg@gmail.com
Size effects in the galvanomagnetic and thermoelectric properties of ultrathin bismuth-antimony films
The paper presents the results of a study of the electrical, galvanomagnetic, and thermoelectric properties of Bi and Bi1–xSbx (x = 0.03, 0.05, and 0.12) thin films (10–50 nm) on a mica substrate. All samples are characterized by an increase in conductivity with a decrease in film thickness, which can be associated with the presence of topologically protected surface states. It has been found that the band structure of the alloys significantly affects the appearance of the metallic type of conductivity in films with a ≤ 18 nm thickness. It was found that the resistivity of Bi0.97Sb0.03 films ≤ 17 nm thick is almost independent of temperature. Despite the increase in the conductivity of the samples, with a decrease in the thickness, the thermoelectric power factor decreases, which casts doubt on the fact that surface states have a positive effect on the thermoelectric figure of merit of thin Bi1–xSbx films. However, the detection of a positive thermoelectric power in Bi0.88Sb0.12 samples may be of interest in the development of the p branch of thermoelectric converters.
10.18721/JPM.161.101
538.935
bismuth
bismuth-antimony alloys
galvanomagnetic properties
thermoelectric properties
thin films
thermoelectric power factor
https://physmath.spbstu.ru/article/2023.63.1/
CNF
RUS
16-21
Ioffe Institute
Myasoedov
Alexander
amyasoedov88@gmail.com
St. Petersburg, Russian Federation
National Research Centre “Kurchatov Institute”, Shubnikov Institute of Crystallography of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences
Pavlov
Ivan
win8765495@gmail.com
Moscow, Russian Federation
Ioffe Institute, Perfect Сrystals LLC
Pechnikov
Aleksey
pechnikovai@gmail.com
St. Petersburg, Russian Federation
Ioffe Institute, Perfect Сrystals LLC
Stepanov
Sergey
s.i.stepanov@gmail.com
St. Petersburg, Russian Federation
Ioffe Institute; Perfect Сrystals LLC
Nikolaev
Vladimir
Nikolaev.V@mail.ioffe.ru
St. Petersburg, Russian Federation
TEM study of the defect structure of α-Ga2O3 layers grown by HVPE
Prismatic stacking faults in α-Ga2O3 films on (0001) Al2O3 substrates are investigated using transmission electron microscopy (TEM). The studied films are grown by halide vapor phase epitaxy (HVPE) up to 1.3 µm in thickness. The initial growth stage results in threading dislocations (TDs) of an average density of 1010 cm–2. The majority of the TDs are identified as 1/3 < 1\(\overline{1}\)00 > partial edge and 1/3 < 1\(\overline{1}\)01 > perfect mixed types using g∙b = 0 invisibility criterion under two-beam diffraction conditions. The edge component of Burgers vector is determined by the Burgers circuit procedure using high-resolution TEM images of dislocation cores. It is suggested that 1/3 < 1\(\overline{1}\)01 > partial dislocations may arise as a result of dissociation of 1/3 < 2\(\overline{1}\)\(\overline{1}\)0 > erfect dislocations which leads to the emergence of prismatic stacking faults in the films.
10.18721/JPM.161.102
538.9
gallium oxide
TEM
dislocations
https://physmath.spbstu.ru/article/2023.63.2/
CNF
RUS
22-27
Ioffe Institute
Kalyuzhniy
Nikolai
nickk@mail.ioffe.ru
Kryzhanovskaya Natalia V.
Natalia
nkryzhanovskaya@hse.ru
35379962200
Ioffe Physical Technical Institute of the Russian Academy of Sciences
Zhukov
Alexey
zhukov@beam.ioffe.ru
Russia, 194021, St.Petersburg, Polytechnicheskaya 26
Melnichenko
Ivan
imelnichenko@hse.ru
Nadtochiy
Alexey
al.nadtochy@mail.ioffe.ru
Ivanov
Konstantin
kivanov@hse.ru
National Research University ‘Higher School of Economics”
Makhov
Ivan
imahov@hse.ru
Maximov
Mikhail
maximov @beam.ioffe.ru
Ioffe Institute
Mintairov
Sergei
mintairov@scell.ioffe.ru
Time-resolved photoluminescence study of InGaAs/GaAs quantum well-dots with upconversion method
For the first time we show time-resolved photoluminescence dependencies with 0.2 ps resolution for the novel type of InGaAs/GaAs quantum-sized heterostructures, referred to as quantum well-dots (QWDs). Photoluminescence upconversion method, that allows achieving time resolution up to 0.2 ps, was used to obtain time-resolved spectra for light (lh) and heavy hole (hh) optical transitions of QWDs. We concluded that the capture of charge carriers to the lh and hh states of QWDs occurs simultaneously in the time range of ~ 10 ps and is probably limited by carrier diffusion in the matrix. The characteristic time of photoluminescence decay for the hh state (3 ns) was found to be greater than that of lh one (2 ns).
10.18721/JPM.161.103
538.9
time-resolved photoluminecsence
InGaAs heterostructures
quantum well-dots
https://physmath.spbstu.ru/article/2023.63.3/
CNF
RUS
28-32
Pitirim Sorokin Syktyvkar State University
Korolev
Roman
korolev36a@gmail.com
Syktyvkar, Russian Federation
Pitirim Sorokin Syktyvkar State University
Antonets
Igor
aiv@mail.ru
Syktyvkar, Russian Federation
Institute of Geology of Komi SC, RAS
Golubev
Evgeniy
yevgenygolubev74@mail.ru
Syktyvkar, Russian Federation
Complex permittivity of graphene containing shungite within 0.05–15 MHz
The paper presents the results of experimental studies of changes in the complex permittivity of natural graphene-containing shungites with different carbon content. A technique for determining the real and imaginary parts of the permittivity for conducting samples is presented. The dependences of the dielectric loss tangent and the real part of the permittivity on the carbon concentration for three resonant frequencies in the range of 0.05–15 MHz are studied.
10.18721/JPM.161.104
538.956
shungite
permittivity
carbon concentration
https://physmath.spbstu.ru/article/2023.63.4/
CNF
RUS
33-37
Ilinskiy
Alexander
ilinskiy@mail.ioffe.ru
Herzen State Pedagogical University of Russia
Castro Arata
Rene
recastro@mail.ru
Peter the Great St. Petersburg Polytechnic University
Pashkevich
Marina
marpash@yandex.ru
Herzen State Pedagogical University of Russia
Popova
Irina
timof-ira@yandex.ru
St. Petersburg, Russian Federation
ITMO University
Sidorov
Aleksandr
sidorov@oi.itmo.ru
St. Petersburg, Russian Federation
Shadrin
Evgeniy
shadr.solid@mail.ioffe.ru
Dielectric spectroscopy of Ag2S nanowires synthesized in porous silicate glasses
We have studied the frequency dielectric spectra of silver sulfide nanowires synthesized in porous silicate glasses. A possible mechanism of the thermal superionic phase transition in the samples is discussed. In this work, based on the analysis of the DS, the following conclusion was made. After the superionic phase transition occurs, the octa coordinated Ag+ ions become mobile, representing the elements of a “viscous liquid”, while the tetra-coordinated Ag+ ions, remaining immobile (up to phonon vibrations), stabilize the crystal lattice of the material.
10.18721/JPM.161.105
537.9
superionic phase transition
nanowires silver iodide
nanoporous silicate glasses
dielectric spectroscopy
https://physmath.spbstu.ru/article/2023.63.5/
CNF
RUS
38-41
Blagoveshchensk State Pedagogical University
Milinskiy
Alexey
a.milinskiy@mail.ru
Blagoveschensk State Pedagogical University
Baryshnikov
Sergey
svbar2003@list.ru
0000-0001-7216-3931
Amur State University
Zeeva
Anna
anutka_2010.1997@mail.ru
Dielectric properties of ferroelectric composite (KNO3)(1–x)/(RbNO3)x
The temperature dependences of the permittivity, the amplitude of the third harmonic and the differential thermal analysis signal for the (KNO3)(1–x)/(RbNO3)x composite were studied. To obtain (KNO3)(1–x)/(RbNO3)x samples, KNO3 and RbNO3 powders with particle size of 5–10 µm were used. The powders were mixed in appropriate proportions, after that the tablets were made at a pressure of 8·103 kg/cm2. The samples with x from 0.05 to 0.5 were examined (x is the volume fraction of RbNO3). Before measurements, the obtained samples were heated to 593 K, which is higher than the melting point of RbNO3, but lower than that of KNO3. It has been found that an increase in the RbNO3 content leads to the appearance of additional phase transitions and the expansion of the temperature region of the ferroelectric phase. The transition temperatures for potassium nitrate do not shift along the temperature axis. For rubidium nitrate, the phase transition at 437 K decreases by 4–5 K, and the temperature hysteresis of this transition increases. The expansion of the ferroelectric phase upon cooling is explained by the superposition of the ferroelectric phases of potassium nitrate and the RbxK(1–x) NO3 solid solution.
10.18721/JPM.161.106
537.226
composite
ferroelectric
potassium nitrate
rubidium nitrate
https://physmath.spbstu.ru/article/2023.63.6/
CNF
RUS
43-48
0000-0001-7223-7232
Moscow Institute of Physics and Technology (National Research University)
Bolshakov
Alexey
acr1235@mail.ru
Moscow, Russian Federation
0000-0002-3469-5897
Alferov University
Kondratev
Valeriy
kvm_96@mail.ru
St. Petersburg, Russian Federation
0000-0001-6869-1213
Alferov University
Vyacheslavova
Ekaterina
cate.viacheslavova@yandex.ru
Morozov
Ivan
morivan@mail.ru
Nalimova
Svetlana
sskarpova@list.ru
0000-0001-6500-5492
St. Petersburg Electrotechnical University "LETI"
Moshnikov
Vyacheslav
vamoshnikov@mail.ru
0000-0002-7632-3194
Alferov University
Gudovskikh
Alexander
gudovskikh@spbau.ru
Study of quasi 1D silicon nanostructures adsorption properties via impedance spectroscopy
The work is aimed at study of correlation between quasi 1D silicon nanostructures adsorption properties and their electrical characteristics in terms of change in Si nanowires impedance under action of different environments with a target adsorbate. Here we fabricate silicon nanowires based gas sensor and demonstrate the possibility of qualitative and quantitative gaseous media analysis for the presence of ammonia. The equivalent electric circuits of the sensor under action of air, water vapour and water ammonia solutions are considered. The sensor response under action of the different adsorbates and optimal impedance spectroscopy parameters are discussed.
10.18721/JPM.161.107
538.9
silicon
nanowires
1D
electrical impedance spectroscopy
https://physmath.spbstu.ru/article/2023.63.7/
CNF
RUS
49-53
St. Petersburg State University
Shtrom
Igor
i.shtrom@spbu.ru
St. Petersburg, Russian Federation
St. Petersburg State University
Verbin
Sergey
s.verbin@spbu.ru
St. Petersburg, Russian Federation
St. Petersburg State University
Agekyan
Vadim
v.agekyan@spbu.ru
St. Petersburg, Russian Federation
St. Petersburg State University
Filosofov
Nikolai
n.filosofov@spbu.ru
St. Petersburg, Russian Federation
Institute of Physics PAN
Karczewski
Grzegorz
carcz@ifpan.edu.pl
Warsaw, Poland
Ioffe Institute
Resnitsky
Alexander
alexander.reznitsky@mail.ioffe.ru
St. Petersburg, Russian Federation
St. Petersburg State University
Serov
Alexey
a.serov@spbu.ru
St. Petersburg, Russian Federation
Ioffe Institute
Smirnov
Alexander
Alex.Smirnov@mail.ioffe.ru
St. Petersburg, Russian Federation
Photoluminescence and energy transfer between CdTe/CdMnTe quantum wells separated by thick barriers
Reflection, luminescence (PL), and luminescence excitation (PLE) spectra of a CdTe/CdMnTe heterostructure with quantum wells of different thicknesses are studied. It has been found that at low temperatures light emission comes from localized exciton states of quantum wells. The PLE spectra show that the contributions of excitons and free carriers to the population of quantum well depend on its thickness. The ratio of these contributions affects the dependence of the quantum well luminescence intensity on the level of optical excitation. It has been established that the coupling of quantum wells, separated by thick barrier layers, occurs through exciton excited states.
10.18721/JPM.161.108
538.935
exciton
heterostructures
coupling quantum wells
https://physmath.spbstu.ru/article/2023.63.8/
CNF
RUS
54-59
Herzen State Pedagogical University of Russia
Castro Arata
Rene
recastro@mail.ru
Herzen State Pedagogical University of Russia
Kononov
Aleksey
kononov_aa@icloud.com
Nikonorova
Natalia
n-nikonorova2004@mail.ru
Charge transfer in thin layers of polymer nanocomposites based on aromatic thermoplastic polyimide and cerium dioxide
The results of the study of the electric charge transfer processes in R-OOD polyimide films and in nanocomposite based on it with cerium dioxide are presented. Using the existing model of charge barrier hopping (CBH), the values of the charge transfer parameters, such as the carrier concentration N, free path length Rω, and potential barrier height WM are calculated. The activation energy of conductivity processes is determined for all samples. The experimental results made it possible to draw following conclusions about the effect of the filler on the polymer matrix:the power-law nature of the frequency dependence of the specific conductivity σ'(ω) and the decrease in the exponent s with an increase in temperature in a wide range of frequencies and temperatures indicate the existence of a hopping mechanism of conductivity in the R OOD + CeO2 composite; charge transfer is a thermally activated process with an activation energy of E = 0.077 eV for R-OOD and E = 0.070 eV for R-OOD + CeO2; the introduction of 3% CeO2 filler into the R-OOD matrix leads to an increase in the specific conductivity in the low-frequency region and a change in the nature of the hopping mechanism of conduction.
10.18721/JPM.161.109
538.935
electric charge transfer
polyimide
cerium dioxide
charge barrier hopping
https://physmath.spbstu.ru/article/2023.63.9/
CNF
RUS
60-66
Peter the Great St. Petersburg Polytechnic University
Damaskinskii
Konstantin
damaskinsk@mail.ru
St. Petersburg, Russian Federation
Ioffe Institute
Damaskinskaya
Ekaterina
Kat.Dama@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Hilarov
Vladimir
vladimir.hilarov@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Nosov
Yury
Yu.Nosov@mail.ioffe.ru
St. Petersburg, Russian Federation
National Research Centre “Kurchatov Institute”
Podurets
Konstantin
podurets_km@nrcki.ru
Moscow, Russian Federation
National Research Centre “Kurchatov Institute”
Kaloyan
Alexandr
alexander.kaloyan@gmail.com
Moscow, Russian Federation
Lomonosov Moscow State University
Korost
Dmitry
dkorost@mail.ru
Moscow, Russian Federation
Specific features of defect structure of a quartz single crystal at early stages of deformation
The paper is concerned with studies of the fracture process in a synthetic quartz single crystal under uniaxial compression at early stages of deformation by three independent techniques, i.e., acoustic emission, X-ray computed tomography and topography using a synchrotron radiation source. The most intense crack formation was observed in the region of higher internal deformations in the original crystal which were detected by topography. The energy of acoustic emission signals and the volume of the defects formed have been found to be linearly related. This result is of practical significance, since it allows estimation of sizes of fracture regions in situ merely by analyzing acoustic emission data in the cases, when other control techniques are inapplicable (for example, during the operation of industrial facilities).
10.18721/JPM.161.110
539.421
acoustic emission
X-ray computed tomography
synchrotron radiation topography (X-ray diffraction imaging)
quartz single crystal
defects volume
https://physmath.spbstu.ru/article/2023.63.10/
CNF
RUS
67-73
National Research Centre “Kurchatov Institute”
Guryev
Valentin
GuryevVV@mail.ru
Moscow, Russian Federation
National Research Centre “Kurchatov Institute”
Irodova
Alla
Irodova_AV@nrcki.ru
Moscow, Russian Federation
National Research Centre “Kurchatov Institute”
Chumakov
Nikolay
Chumakov_NK@nrcki.ru
Moscow, Russian Federation
National Research Centre “Kurchatov Institute”
Shavkin
Sergey
Shavkin_SV@nrcki.ru
Moscow, Russian Federation
Low-field magnetization features of superconducting tapes with strong pinning anisotropy
The electrodynamic behavior of II-type superconductors is determined by the physics of the vortex matter, for which the superconducting material is the medium of existence. It is noteworthy that for all practical superconductors this medium is both anisotropic and inhomogeneous. On the basis of data on the degree of inhomogeneity and anisotropy, some features of magnetization in low external field, comparable to self-field, can be explained. Namely: 1) an anomalous shift of the central magnetization peak, and 2) the fishtail shape in inclined magnetic fields. In this paper, we present an experimental study of the low-field magnetization of Nb-Ti tapes. The degree of anisotropy was varied by heat treatment of the original cold-rolled tape and by slicing the samples along and across the rolling direction. The obtained results are discussed in comparison with the features of the magnetization loops of other practical superconductors.
10.18721/JPM.161.111
537.9
vortex matter
magnetization
fishtail
pinning anisotropy
https://physmath.spbstu.ru/article/2023.63.11/
CNF
RUS
74-78
Ioffe Institute
Valeeva
Alsu
ValeevaAR@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Pronin
Igor
petrovich@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Kaptelov
Eugeneiy
kaptelov@mail.ioffe.ru
St. Petersburg, Russian Federation
Senkevich
Stanislav
SenkevichSV@mail.ioffe.ru
Nemov
Sergei
nemov_s@mail.ru
National Research Centre “Kurchatov Institute”
Staritsyn
Mikhail
ms_145@mail.ru
Moscow, Russian Federation
Microstructure and ferroelectric properties of submicron polycrystalline lead zirconate titanate films with a gradient composition distribution over the thickness
The paper presents the results of two-layer thin ferroelectric PZT films studies with a change in the lead content over the thickness of the films, obtained by RF magnetron deposition at various pressures of the working gas mixture. The microstructure and elemental composition were investigated by scanning electron microscopy and electron probe X-ray spectral microanalysis. It is shown that the elemental composition and dielectric properties depend on the sequence of layers deposition. The results obtained make it possible to characterize the physical mechanism of self-polarization formation in thin PZT films.
10.18721/JPM.161.112
537.266.4
thin ferroelectric films
lead zirconate titanate
RF magnetron sputtering
non uniform distribution of lead over the thickness
https://physmath.spbstu.ru/article/2023.63.12/
CNF
RUS
79-83
Ioffe Institute
Mynbaeva
Marina
mgm@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Lebedev
Sergey
lebedev.sergey@mail.ioffe.ru
St. Petersburg, Russian Federation
Self-organization of the structure of porous silicon carbide under external influences
This paper presents the results of a study of the effect of external influences on the structure and phase composition of porous SiC layers obtained by anodization. It is shown how carrying out of standard technological operations makes it possible to control the properties of porous structures and significantly expands the variety of their morphological forms. The conditions facilitating the occurrence of phase-structural and polytype transformations in porous SiC structures are determined.
10.18721/JPM.161.113
538.911
silicon carbide
porous structure
external influences
self-organization
https://physmath.spbstu.ru/article/2023.63.13/
CNF
RUS
84-89
Ioffe Institute
Gureva
Svetlana
swet.gurjewa@gmail.com
St. Petersburg, Russian Federation
Ioffe Institute
Marikhin
Vyacheslav
v.marikhin@mail.ioffe.ru
St. Petersburg, Russian Federation
Institute of Macromolecular Compounds RAS
Vlasova
Elena
spectra@imc.macro.ru
St. Petersburg, Russian Federation
Conformational disorder and its effect on structural phase transitions in tricosane С23Н48
The kinetics of the first-order solid-solid structural phase transition in monodisperse n-alkane samples of odd tricosane C23H48 was studied by FTIR spectroscopy. The detailed study of the structure rearrangements of long-chain molecular crystals of n-alkanes during solid-state transitions has been carried out and the existence of many irregular conformers in solid phases of tricosane, the concentration of which reaches a maximum when approaching the melting point, has been demonstrated. The presence of these conformational defects has been found to promote the development of a new phase in the bulk of the initial one and to facilitate the transitions between different intermediate rotator phases in the solid state. Thus, the significant role has been demonstrated for the appearance of various intramolecular conformational defects during heating of n-alkanes, which promote interfacial transitions from the solid to the liquid state, weakening the intermolecular interaction and increasing the freedom degree of molecules.
10.18721/JPM.161.114
538.913
n-alkane
phase transition
IR spectroscopy
https://physmath.spbstu.ru/article/2023.63.14/
CNF
RUS
90-96
Ioffe Institute
Borisov
Artem
borisov.ak@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Egorov
Victor
victor_egorov1@inbox.ru
St. Petersburg, Russian Federation
Ioffe Institute
Marikhin
Vyacheslav
v.marikhin@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Myasnikova
Lubov
liu2000@mail.ru
St. Petersburg, Russian Federation
Dimensional effect of nanocrystalline elements of the polyethylene structure
The method for calculating the size distribution of nanocrystalline elements in lamellar and fibrillar polymer morphologies was proposed. The distribution of the longitudinal size of these elements in lamellas and microfibrils of ultrahigh molecular weight polyethylene was calculated using differential scanning calorimetry data. The calculation results are consistent with the data obtained by the X-ray method.
10.18721/JPM.161.115
538.911
ultrahigh molecular weight polyethylene
lamella
fibril
differential scanning calorimetry
phase transition
https://physmath.spbstu.ru/article/2023.63.15/
CNF
RUS
97-101
Institute of Geology of Komi SC, RAS
Golubev
Evgeniy
yevgenygolubev74@mail.ru
Syktyvkar, Russian Federation
Pitirim Sorokin Syktyvkar State University
Antonets
Igor
aiv@mail.ru
Syktyvkar, Russian Federation
Pitirim Sorokin Syktyvkar State University
Korolev
Roman
korolev36a@gmail.com
Syktyvkar, Russian Federation
Frequency and concentration dependences of the electrical properties of natural disordered carbon in the high-frequency region
Disordered sp2 carbon of geological origin (shungite rocks of Karelia) with a set of various nanostructures (fullerene-like, graphene, ribbons) has promising technological properties. In this work, we studied the effect of nanosized carbon structures on the electrical properties. The impedance, active and reactance resistance, inductance of carbon-containing materials were measured in the frequency range from 50 kHz to 15 MHz. The inductive nature of the conductivity of shungite carbon was found. With increasing frequency, the resistance of shungite carbon increases. This nature of conductivity can be associated with the predominant effect on the electrical properties in shungites of nanosized ribbon structures.
10.18721/JPM.161.116
549.08; 538.975
disordered sp2 carbon
nanostructure
electrophysical characteristics
https://physmath.spbstu.ru/article/2023.63.16/
CNF
RUS
102-108
Kuban State University
Shmargilov
Sergey
122ftf@mail.ru
Krasnodar, Russian Federation
Kuban State University
Galutskiy
Valeriy
galutskiy17v@mail.ru
Krasnodar, Russian Federation
Kuban State University
Puzanovskiy
Kirill
puzanovsky.kv@yandex.ru
Krasnodar, Russian Federation
Kuban State University
Stroganova
Elena
stroganova@kubsu.ru
Krasnodar, Russian Federation
Influence of the refractive index gradient on the transmission coefficient in the 1.5-micron range in an electro-optical converter based on lithium niobate
The paper presents the results of a study of the effect of the composition gradient and refractive index on the attenuation of an optical signal at a wavelength of 1.55 microns. The attenuation measurements were carried out by the breakage method and the comparison method, the attenuation by both methods was 0.9 dB/cm when waveguides were formed along the change in the lithium composition in the crystal plate of the composition Li0.94...0.98Nb1.06...1.02O3.12...3.04.
10.18721/JPM.161.117
538.9, 535.3
optical waveguide
optical losses
lithium niobate
https://physmath.spbstu.ru/article/2023.63.17/
CNF
RUS
109-112
Ioffe Institute
Dunaevskiy
Mikhail
Mike.Dunaeffsky@mail.ioffe.ru
St. Petersburg, Russian Federation
Study of mechanical resonance frequencies in tapered nanowires
In this paper, the transcendental equation was obtained in the framework of the Euler–Bernoulli beam theory, which allows obtaining the values of resonant frequencies for any tapered nanowire. Calculations of the frequencies of the first few resonances of mechanical oscillations for nanowires with various conicity (the average radius and length of the nanowire remained constant) were performed. It was established that the frequencies of the first three modes increase with an increase in the conicity angle, while the frequency of the fourth mode (n = 4) is nearly constant and independent of the conicity angle. It was also established that the frequencies of the higher order (n > 4) modes decrease with an increase in the conicity angle. The ratios of the resonance values of the first few modes can be used to clarify the conicity value, which is necessary when determining the Young's modulus of tapered nanowires.
10.18721/JPM.161.118
534.13; 539.3; 538.9
nanowires
tapered nanowires
mechanical resonances frequencies
Young's modulus
https://physmath.spbstu.ru/article/2023.63.18/
CNF
RUS
113-118
Institute for Problems of Mechanical Engineering RAS
Kukushkin
Sergey
sergey.a.kukushkin@gmail.com
St. Petersburg, Russian Federation
Institute for Problems of Mechanical Engineering RAS
Eremeev
Iurii
iuriyeremeev528@gmail.com
St. Petersburg, Russian Federation
Institute for Problems of Mechanical Engineering RAS
Vorobev
Maxim
vmaximg@bk.ru
St. Petersburg, Russian Federation
Institute for Problems of Mechanical Engineering RAS
Grashchenko
Alexander
asgrashchenko@bk.ru
St. Petersburg, Russian Federation
Alferov University
Pirogov
Evgeny
zzzavr@gmail.com
St. Petersburg, Russian Federation
Peter the Great St. Petersburg Polytechnic University
Andreeva
Valentina
avd2007@bk.ru
St. Petersburg, Russian Federation
Institute for Problems of Mechanical Engineering RAS
Osipov
Andrey
andrey.v.osipov@gmail.com
St. Petersburg, Russian Federation
Evolution of the crystal microstructure of hybrid SiC/Si substrates grown by the method of atomic substitution
3C-SiC/Si (111) hybrid structures are grown by the method of coordinated atomic substitution on the boron- and phosphorus-doped Si(111) substrates. The evolution of the microstructure is analyzed in the time range of 1–40 minutes. The results show the reconstruction of the 3C-SiC (111) film at 3–5 minutes of the growth. The difference between strain in the SiC film obtained on p-Si and n-Si is shown using XRD and Raman techniques.
10.18721/JPM.161.119
546.281
silicon carbide
elastic strain
coordinated atomic substitution
microstructure
https://physmath.spbstu.ru/article/2023.63.19/
CNF
RUS
119-125
Ioffe Institute
Lukhmyrina
Tatiana
h7k9g00@gmail.com
St. Petersburg, Russian Federation
Ioffe Institute
Klimov
Aleksandr
a.klimov@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Kunkov
Roman
romunkov@yandex.ru
St. Petersburg, Russian Federation
Ioffe Institute
Lebedeva
Natalia
natali_lebedeva@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Matveev
Boris
bmat@iropt3.ioffe.ru
St. Petersburg, Russian Federation
Submicron Heterostructures for Microelectronics Research and Engineering Center of the RAS
Chernyakov
Anton
chernyakov.anton@yandex.ru
Russia, 194021, St.Petersburg, Polytechnicheskaya, 26
Temperature distribution in InAsSbP/InAsSb/InAs double heterostructure on-chip sensors
The paper presents temperature distribution analysis in activated on-chip chemical sensor based on p-InAsSbP/n-InAsSb/n-InAs 1×3 diode array. Temperature distributions were obtained both experimentally with the use of infrared microscopy, by I-V characteristic analysis and by finite element modelling. The simulated temperature values are in reasonable agreement with experimental data, allowing one to establish a relationship between the temperature of active elements of the sensor. The relationship is important for the improvement of chemical analysis accuracy.
10.18721/JPM.161.120
538.9
Temperature distribution
1×3 diode array
on-chip chemical sensor
mid-IR photodiodes
mid-IR LEDs
modelling
IR microscopy
https://physmath.spbstu.ru/article/2023.63.20/
CNF
RUS
126-130
Puchkov
Nikolai
muxanin@mail.ru
Vladimir
Vladimir
solovyev_v55@mail.ru
Cvetkov
Alexander
Yanikov
Mikhail
losthighway@mail.ru
Propagation of surface plasmon-polaritons in metal-dielectric structures based on opals
Calculations based on the analysis of experimental data allow us to estimate a period of a two-dimensional diffraction grating made of opal globules and to make assumptions about possible directions of surface plasmon-polaritons propagation in metal-dielectric hybrid plasmon-photonic crystals.
10.18721/JPM.161.121
539.216:535.346
surface plasmon-polaritons
opal globules
metal-dielectric structure
hybrid plasmon-photonic crystal
https://physmath.spbstu.ru/article/2023.63.21/
CNF
RUS
131-136
ITMO University
Babkina
Anastasiia
babkina.anastasya@bk.ru
St. Petersburg, Russian Federation
Zyryanova
Ksenia
ms.z.k.s@mail.ru
ITMO University
Kulpina
Ekaterina
katrinakulpina@yandex.ru
St. Petersburg, Russian Federation
0000-0003-0757-9927
ITMO University
Gavrilov
Ruslan
St. Petersburg, Russian Federation
Alkali ion effect on phase transition temperatures of CuCl nanocrystals in potassium-alumina-borate glass
The effect of the Na/K ratio on the phase transition temperatures of CuCl nanocrystals in potassium-alumina-borate glass is studied. The size effect in the location of the exciton absorption is confirmed. By increasing the content of sodium ions in glass, it is possible to increase the melting point of CuCl crystals with a mean size of 3.1 nm from 152 to 168 °C. It is assumed that in the matrix of potassium alumina-borate glass, instead of pure CuCl crystals, a CuCl-RCl (R = Na, K) solid solution crystallizes during the heat treatment.
10.18721/JPM.161.122
535.341
copper halides
melting temperature
crystallization temperature
solid solution
https://physmath.spbstu.ru/article/2023.63.22/
CNF
RUS
137-141
Ioffe Institute
Vasilyev
Yuri
yu.vasilyev@mail.ioffe.ru
St. Petersburg, Russian Federation
Two-dimensional plasmon excitations in a random array of quantum antidots
Terahertz absorption in two-dimensional electron systems in an AlGaAs/GaAs heterojunction containing a layer of self-organizing antidots is experimentally studied. A magnetoplasmon mode is observed in a magnetic field. When the electron density at the heterojunction is less than the density of the disorder potential minima induced by the antidots we found the drastic narrowing of the absorption line with magnetic field. We interpret this effect by magnetic field induced localization. The localized plasmon resonances are coupled by the Coulomb electron-electron interactions leading to collective magnetoplasmon excitations.
10.18721/JPM.161.123
621.315.592
heterojunction
magnetoplasmon
antidots
terahertz absorption
https://physmath.spbstu.ru/article/2023.63.23/
CNF
RUS
142-145
Ioffe Institute
Chikurov
Daniil
d.chikurov@yandex.ru
St. Petersburg, Russian Federation
Ioffe Institute
Volkov
Mihail P.
m.volkov@mail.ioffe.ru
St. Petersburg, Russian Federation
Study of the anisotropy of critical currents in 2G-HTSC tapes by a non-contact method
A simple and reliable method for determining the critical current of a HTSC tape is a non-contact method based on capturing the magnetic flux by a closed superconducting ring made of this tape and measuring the magnetic field in the center of the ring with a field sensor. This method also makes it possible to obtain the dependence of the critical current on the magnetic field by applying a magnetic field locally on a small section of the tape. A local magnetic field can be created using strong permanent magnets, which also makes it possible to apply the field at different angles relative to the plane of the tape and to determine the anisotropy of critical currents. Using this method, experiments were carried out on rings made of a SuperOx HTSC tape at T = 77 K and in a magnetic field up to 4 kOe. The values obtained for the anisotropy of critical currents are in good agreement with the data given by the manufacturer.
10.18721/JPM.161.124
538.945.9
superconductivity
HTSC
critical current
anisotropy
magnetic flux capture
https://physmath.spbstu.ru/article/2023.63.24/
CNF
RUS
146-152
Ioffe Institute
Argunova
Tatiana
argunova@mail.ioffe.ru
St. Petersburg, Russian Federation
National Research Centre “Kurchatov Institute”
Kohn
Victor
kohnvict@yandex.ru
Moscow, Russian Federation
Ioffe Institute
Krymov
Vladimir
v.krymov@mail.ioffe.ru
St. Petersburg, Russian Federation
Study of defects in shaped sapphire crystals by synchrotron X-ray phase contrast imaging
Single crystalline sapphire ribbons grown by the Stepanov method exhibit relatively high dislocation densities and often contain slightly misoriented grains. In order to understand the formation of dislocation structures during growth, we studied neck portions cut off perpendicular to the growth axis [ \(\overline{1}\) 010] of basal-plane-faceted ribbons. The samples have been characterized using phase-contrast and Bragg-diffraction imaging (topography) with synchrotron radiation. It has been found that in the growth direction from the neck towards the main body of the ribbon the dislocation density increases due to multiplication of dislocations. Combining the both imaging techniques, the dislocations were shown to be located around gas voids in sapphire crystals. Computer simulations of the phase-contrast images were carried out to obtain the correct size of the voids.
10.18721/JPM.161.125
548.73
synchrotron phase contrast imaging
computer simulations
shaped sapphire
https://physmath.spbstu.ru/article/2023.63.25/
RAR
RUS
153-157
Alferov University
Soshnikov
Ilya
ipsosh@beam.ioffe.ru
St. Petersburg, Russian Federation
St. Petersburg State University
Khrebtov
Artem
khrebtovart@mail.ru
St. Petersburg, Russian Federation
Cirlin
George
george.cirlin@mail.ru
Reznik
Rodion
moment92@mail.ru
Gridchin
Vladislav
gridchinvo@gmail.com
Kotlyar
Konstantin
konstantin21kt@gmail.com
Dragunova
Anna
anndra@list.ru
Kryzhanovskaya Natalia V.
Natalia
nkryzhanovskaya@hse.ru
Alferov University; IAI RAS
Samsonenko
Yurii
samsonenko@beam.ioffe.ru
St. Petersburg, Russian Federation
Features of MBE growth of AlGaAs nanowires with InAs quantum dots on the silicon surface
AlGaAs nanowires with InAs quantum dots on the silicon surface were synthesized by molecular-beam epitaxy. Morphological and optical properties of grown nanostructures were studied. It is important to note, that emission from quantum dots is observed in the wavelength range from 780 to 970 nm. Assumptions about the nature of short-wave radiation from quantum dots were formulated. In particular, one of the reasons may be the significant desorption of indium atoms and the presence of gallium atoms in the catalyst droplets during growth at the substrate temperature of 510 °C. Our work, therefore, opens new prospects for integration of direct bandgap semiconductors with silicon platform.
10.18721/JPM.161.126
538.975
III-V semiconductors
nanowires
quantum dots
molecular-beam epitaxy
silicon
https://physmath.spbstu.ru/article/2023.63.26/
CNF
RUS
158-161
0000-0002-3640-677X
Ioffe Institute
Kaveev
Andrey
kaveev@mail.ioffe.ru
St. Petersburg, Russian Federation
Formation of a dielectric sublayer heterostructure of lead-tin telluride
We have optimized the growth parameters of the buffer layer for further Pb1-xSnxTe (x ≥ 0.4) deposition from the point of view of smoothness and crystalline quality. The latter has the properties of a crystalline topological insulator. A three-component heterostructure consisting of fluorite CaF2, BaF2, and cubic Pb0.7Sn0.3Te:In layers was formed on the Si(111). The surface morphology of this hybrid heterostructure was studied depending on the growth temperature and the thickness.
10.18721/JPM.161.127
538.911
molecular beam epitaxy
Pb0.7Sn0.3Te
topological insulators
https://physmath.spbstu.ru/article/2023.63.27/
CNF
RUS
162-166
Lobachevsky State University of Nizhni Novgorod
Korolev
Dmitry
dmkorolev@phys.unn.ru
Nizhni Novgorod, Russian Federation
Institute of Solid State Physics RAS
Tereshchenko
Alexey
tan@issp.ac.ru
Chernogolovka, Russian Federation
Lobachevsky State University of Nizhni Novgorod
Nikolskaya
Alena
nikolskaya@nifti.unn.ru
Nizhni Novgorod, Russian Federation
Lobachevsky State University of Nizhni Novgorod
Mikhaylov
Alexei
mian@nifti.unn.ru
Nizhni Novgorod, Russian Federation
Lobachevsky State University of Nizhni Novgorod
Belov
Alexey
belov@nifti.unn.ru
Nizhni Novgorod, Russian Federation
Lobachevsky State University of Nizhni Novgorod
Tetelbaum
David
tetelbaum@phys.unn.ru
Nizhni Novgorod, Russian Federation
Дислокационная фотолюминесценция в самоимплантированном кремнии с различными ориентациями поверхности
The regularities of the influence of initial substrate orientation and annealing conditions on the intensity and temperature dependence of the D1 luminescence line for the p-type silicon samples implanted with silicon ions followed by subsequent annealing are studied. It is shown that the luminescent properties of the samples depend both on surface orientation and on annealing temperature. For a silicon sample with (111) surface orientation, under certain heat treatment conditions, an anomalous temperature dependence of the D1 line intensity is demonstrated with the appearance of a second maximum in this dependence at temperatures of about 80 K.
10.18721/JPM.161.128
537.9
кремний
ионная имплантация
отжиг
фотолюминесценция
https://physmath.spbstu.ru/article/2023.63.28/
CNF
RUS
167-171
Ivanov
Anton
a-e-ivano-v@yandex.ru
Submicron Heterostructures for Microelectronics Research and Engineering Center of the RAS
Chernyakov
Anton
chernyakov.anton@yandex.ru
Russia, 194021, St.Petersburg, Polytechnicheskaya, 26
Submicron Heterostructures for Microelectronics Research and Engineering Center of the RAS
Zakgeim
Alexander
zakgeim@mail.ioffe.ru
Russia, 194021, St.Petersburg, Polytechnicheskaya, 26
Comprehensive study of the power capabilities of UV-C LEDs in pulsed and continuous modes
Data is reported on study of light-current characteristics and thermal properties of flip-chip AlGaN UV-C LED over a wide range of excitation levels: up to 2 kA/cm2 in pulse mode. The tailor-made microscope based on InAs matrix with photosensitivity in 2.5–3.1 µm range was employed for getting IR-intensity maps and revealing of temperature distribution across the emitting chips. The work is aimed at detailed study the factors limiting the energy capabilities of UV-C LEDs.
10.18721/JPM.161.129
621.382.2
power UV-C LED
thermal resistance
temperature mapping
https://physmath.spbstu.ru/article/2023.63.29/
CNF
RUS
172-177
Ioffe Institute
Ionov
Alexander
ionov@tuch.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Volkov
Mihail P.
m.volkov@mail.ioffe.ru
St. Petersburg, Russian Federation
Institute of Macromolecular Compounds RAS
Nikolaeva
Marianna
marianna_n@mail.ru
St. Petersburg, Russian Federation
Institute of Macromolecular Compounds RAS
Smyslov
Ruslan
urs@macro.ru
St. Petersburg, Russian Federation
Institute of Macromolecular Compounds RAS
Bugrov
Alexander
anbugrov@etu.ru
St. Petersburg, Russian Federation
Magnetization of different types of reduced graphene oxide in composites based on polystyrene
The transition from 'the initial graphite material, consisting of multilayer graphene of macroscopic size, to its oxidized form occurring as films, followed by their thermal reduction in an atmosphere of hydrogen, allows for obtaining submicron galleries of reduced graphene oxide with oxygen-containing groups on the surface. Such hydroxyl and carboxyl groups were used to functionalize the surface of graphene nanosheets with methacrylate groups to twist graphene layers relative to each other during in-situ copolymerization with styrene. In such a composite, mechanical stresses and defects are potential in the graphene nanosheets, which may be the reason for local superconductivity at room temperature. A similar effect was also recorded for photoreduced graphene oxide with a perforated surface as a component of a polystyrene-based composite.
10.18721/JPM.161.130
538.945
UV irradiation
reduced graphene oxide
polymeric matrix
percolation
carbon electronics
https://physmath.spbstu.ru/article/2023.63.30/
CNF
RUS
178-184
Ioffe Institute
Conyuh
Dmitry
conyuh.dmitrij@yandex.ru
St. Petersburg, Russian Federation
Ioffe Institute
Beltukov
Yaroslav
ybeltukov@gmail.com
St. Petersburg, Russian Federation
Quasi-local vibrations of amorphous solids in correlated random matrix theory
We apply the random matrix theory to the study of quasi-localized modes in amorphous solids having correlated disorder due to the stability criterion. We demonstrate that the number and properties of quasi-local vibrations depend significantly on how much the statistics of the dynamical matrix elements differs from the Gaussian one. The quasi-localized regime of the vibrational density of states can be understood in the framework of a perturbation theory, which managed to identify the low-frequency asymptotic.
10.18721/JPM.161.131
539.21
amorphous solids
quasi-localized modes
random matrices
https://physmath.spbstu.ru/article/2023.63.31/
CNF
RUS
185-190
Saratov State Univercity
Martyshkin
Alexandr
aamartyshkin@gmail.com
Saratov, Russian Federation
Saratov State Univercity
Gubanova
Yulya
yulya29022095@gmail.com
Saratov, Russian Federation
Saratov State Univercity
Beginin
Eugeny
egbegin@gmail.com
Saratov, Russian Federation
Saratov State Univercity
Sadovnikov
Alexandr
sadovnikovav@gmail.com
Saratov, Russian Federation
Interconnect elements of magnonic networks based on controlled meander 3D magnonic structures
Here we propose the different simple building block of the three-dimensional (3D) magnonic network in the form of the joined orthogonal sections of magnonic waveguides. It was shown, that the proposed 3D structures allows the transmission of spin-wave signals in the regime of surface magnetostatic wave propagation without the significant losses due to the junction region. Micromagnetic simulation was used to reveal the mechanism of spin-wave propagation across 3D junction. An electrodynamic problem is considered by the finite element method and the dispersion characteristics of spin waves (SW) are constructed with a change in the geometric parameters of the meander. The nature of the change in the frequency ranges of the Bragg band gaps depending on the meander profile has been studied in detail. It was demonstrated that spin-wave waveguiding 3D structure with broken translational symmetry exploiting the vertical spin-wave transport provides the transmission of the information signal in three-dimensional configuration of magnonic networks.
10.18721/JPM.161.132
537.9
Spin wave
micromagnetic calculation
3D structure
Brillouin-spectroscopy
https://physmath.spbstu.ru/article/2023.63.32/
CNF
RUS
191-196
Shukshin Altai State University for Humanities and Pedagogy
Cherednichenko
Anton
anton.chered@mail.ru
Biysk, Russian Federation
Peter the Great St. Petersburg Polytechnic University
Zakharov
Pavel
zakharovpvl@rambler.ru
St. Petersburg, Russian Federation
Shukshin Altai State University for Humanities and Pedagogy
Eremin
Alexander
eam77@yandex.ru
Biysk, Russian Federation
Polzunov Altai State Technical University
Starostenkov
Mikhail
genphys@mail.ru
Barnaul, Russian Federation
Ufa State Aviation Technical University
Korznikova
Elena
elena.a.korznikova@gmail.com
Ufa, Russian Federation
Institute of Molecule and Crystal Physics, Ufa Federal Research Center of RAS
Dmitriev
Sergey
dmitriev.sergey.v@gmail.com
Ufa, Russian Federation
Effect of surface curvature of an FCC crystal on the characteristics of localized vibrations of atoms
Localized states of discrete structures play an important role in energy transfer and reduction of potential barriers for local structure transformation. In this paper, we consider the influence of the surface curvature of the crystal with cylindrical symmetry on the possibility of excitation of surface localized modes. The study is performed by means of molecular dynamics method. A face-centered cubic crystal of composition A3B with an L12 superstructure, where component A is Pt, B is Al is considered. The interaction of particles was described by the interatomic potential obtained by the embedded atom method. We demonstrate the fundamental possibility of the existence of localized modes on the surface under consideration. External oscillations, in turn, can imitate the boundary conditions corresponding to the dynamics of the crystal volume, thereby leading to the consideration of modes located far from the surface. The energy and dynamic characteristics of localized excitations are calculated as functions of the curvature and location of the atom on the crystal surface.
10.18721/JPM.161.133
538.913
localized states
surface
molecular dynamics
https://physmath.spbstu.ru/article/2023.63.33/
CNF
RUS
197-204
Bauman Moscow State Technical University
Simkin
Ivan
vanyasimkin@gmail.com
Moscow, Russian Federation
Bauman Moscow State Technical University
Yakovlev
Egor
yakov.egor@gmail.com
Moscow, Russian Federation
Bauman Moscow State Technical University
Kryuchkov
Nikita
kruchkov_nkt@mail.ru
Moscow, Russian Federation
Bauman Moscow State Technical University
Korsakova
Sofia
sofia.korsakova@gmail.com
Moscow, Russian Federation
Bauman Moscow State Technical University
Yurchenko
Stanislav
st.yurchenko@mail.ru
Moscow, Russian Federation
Calculation of correlation lengths in 2D Lennard-Jones fluids
The process of spinodal decomposition in two-dimensional system that was obtained by molecular dynamics simulation has been analysed using the correlation of reciprocal areas of the Voronoi cells. Correlation lengths dependence n the temperature and the critical exponent of the LJ12-6 system in the fluctuation region by the general renormalization group (RG) framework were calculated. We showed the agreement of the calculated critical exponent ν with both experiments and theory. The proposed methodology for correlations of the reciprocal areas of the Voronoi cells is well applicable in the experiments with 2D colloidal systems.
10.18721/JPM.161.134
538.9
soft matter
colloidal particles
tuned self-assembly
phase transitions
molecular dynamics
https://physmath.spbstu.ru/article/2023.63.34/
CNF
RUS
205-210
Bauman Moscow State Technical University
Libet
Pavel
libetpa@gmail.com
Moscow, Russian Federation
Bauman Moscow State Technical University
Shirokova
Anastasia
shirokova2001@yandex.ru
Moscow, Russian Federation
Bauman Moscow State Technical University
Simkin
Ivan
vanyasimkin@gmail.com
Moscow, Russian Federation
Bauman Moscow State Technical University
Yakovlev
Egor
yakov.egor@gmail.com
Moscow, Russian Federation
Bauman Moscow State Technical University
Yurchenko
Stanislav
st.yurchenko@mail.ru
Moscow, Russian Federation
Application of conical magnetic rotating fields for controlled colloidal self-assembly
Tunable interactions under the influence of external electric and magnetic fields open the way to controlled transport and self-organization in model and living systems. In this paper, we establish new experimental system parameters for tuning interparticle interactions in colloidal systems using a three-dimensional precessing conical magnetic field. The paper presents a digital twin of the experimental setup, simulation of electromagnetic fields in order to find the optimal self-assembly parameters. The results of pilot experiments with magnetic particles of silicon dioxide 2.47 µm in size in deionized water are demonstrated, the phenomenon of controlled self-assembly is shown.
10.18721/JPM.161.135
538.9
soft matter
self-assembly
magnetic fields
colloids
https://physmath.spbstu.ru/article/2023.63.35/
RAR
RUS
211-217
0000-0002-9600-2021
Derzhavin Tambov State University
Yakovlev
Alexey
Tambov, Russian Federation
Derzhavin Tambov State University
Fedorov
Victor
fedorov-tsu.tmb@inbox.ru
Tambov, Russian Federation
Derzhavin Tambov State University
Balybin
Dmitry
balybindv@gmail.com
Tambov, Russian Federation
Derzhavin Tambov State University
Pluzhnikova
Tatiana
plushnik@mail.ru
Tambov, Russian Federation
Derzhavin Tambov State University
Boitsova
Margarita
mvboitsova@mail.ru
Tambov, Russian Federation
Derzhavin Tambov State University
Fedotov
Dmitry
dmitry_989@mail.ru
Tambov, Russian Federation
0000-0001-5957-4525
Derzhavin Tambov State University
Berezner
Arseniy
Tambov, Russian Federation
Features of electrochemical behavior of an amorphous iron-based alloy in acidic solutions containing potassium rhodanide
Impact of acidic solution with potassium rhodanide on partial electrode reactions was studied in AMAG-200 metallic glass (MG). Increase of acidity leads to growth of electrochemical reactions. With (mol/l) growth of potassium rhodanide in hydrochloric solution, radius of a circular Nyquist diagram increases that testifies to better corrosion resistance of AMAG-200 MG in mentioned environment. Surface coverage ratio of rhodanide-ions increases up to the 0.9—0.99 maximum with adding of potassium rhodanide. Because of the physic-mechanical features of the solution, surface co-adsorption of rhodanide-ions, Сl-, H3O+ ions, and НSCN, Н2О molecules is possible that can lead to competitive adsorption, noticing in diagrams.
10.18721/JPM.161.136
544.2
potassium rhodanide
electrochemistry
acidic solutions
https://physmath.spbstu.ru/article/2023.63.36/
CNF
RUS
218-224
Peter the Great St. Petersburg Polytechnic University
Belyaev
Kirill
kbelyaev@cfd.spbstu.ru
St. Petersburg, Russian Federation
0000-0002-2775-9864
Peter the Great St. Petersburg Polytechnic University
Garbaruk
Andrei
agarbaruk@mail.ru
0000-0001-9473-7430
Peter the Great St. Petersburg Polytechnic University
Golubkov
Valentin
golubkovvd@gmail.com
St. Petersburg, Russian Federation
Peter the Great St. Petersburg Polytechnic University
Strelets
Michael
strelets@mail.rcom.ru
St. Petersburg, Russian Federation
Application of global stability analysis to predicting characteristics of Tollmien-Schlichting waves
A numerical procedure is presented for computing characteristics of Tollmien–Schlichting (T-S) waves in the course of their downstream evolution. It is based on the Global Stability Analysis of steady solutions of the full compressible Navier-Stokes equations and, therefore, does not have the restrictions associated with the parallel or quasi-parallel flow assumptions used in the classical methods of the linear stability analysis based on the boundary layer approximation. Hence, the methodology may be applied not only to simple boundary layers on smooth surfaces but also to non-parallel flows, e.g. those over surfaces with irregularities (steps, gaps, etc.). The developed procedure is validated by the comparison of the computed distribution of the T-S amplification factor (N-factor) in the zero pressure gradient boundary layer with the similar distribution computed based on the solution of the Orr-Sommerfeld equation and is shown to be accurate and robust.
10.18721/JPM.161.137
532.517.3
Global stability analysis
Tollmien-Schlichting waves
Boundary layer
https://physmath.spbstu.ru/article/2023.63.37/
CNF
RUS
225-230
Tver State University
Veresov
Sergey
veresovsergei@mail.ru
Tver, Russian Federation
Institute of Information and Communication Technologies, Bulgarian Academy of Sciences
Mikhov
Rossen
rmikhov@abv.bg
Sofia, Bulgaria
Institute of Information and Communication Technologies, Bulgarian Academy of Sciences
Kirilov
Leoneed
l_kirilov_8@abv.bg
Sofia, Bulgaria
Tver State University
Myasnichenko
Vladimir
viplabs@ya.ru
Tver, Russian Federation
Tver State University
Sokolov
Denis
dnsokolov@mail.ru
Tver, Russian Federation
Tver State University
Sdobnyakov
Nickolay
nsdobnyakov@mail.ru
Tver, Russian Federation
Tver State University
Ershov
Pavel
ershovpaul@gmail.com
Tver, Russian Federation
Tver State University
Nepsha
Nikita
nepsha.nikita@yandex.ru
Tver, Russian Federation
Tver State University
Veselov
Alexey
Tver, Russian Federation
Adaptation of the Monte-Carlo method for modeling layer-by-layer growth of clusters and nanoalloys
In this paper, we study the layer-by-layer growth process of a bimetallic nanoparticle Au-Ag having face-centered cubic and decahedron structure. The Monte Carlo method was chosen to implement this problem combined with an approach from molecular dynamics. The Monte Carlo method allows solving of problems with periodic boundary conditions. Computer implementations of the method have been developed in two different software products Metropolis (Tver State University) and Tsuyoyama (Institute of Information and Communication Technologies). Interaction between atoms is calculated using multi-body tight-binding model. It is established that the order of addition of atoms (simultaneous or layered) affects the chemical ordering in the studied gold-silver equiatomic nanoalloys. In addition, the difference between the values of specific energy corresponding to Metropolis and Tsuyoyama software becomes quite small, supporting the inference that the numerical procedure for the layer-by-layer growth is adequate.
10.18721/JPM.161.138
539.21: 536.911+536.912
computer simulation
Monte-Carlo method
molecular dynamics method
layer- by-layer growth
nanoalloy
https://physmath.spbstu.ru/article/2023.63.38/
CNF
RUS
231-235
Ioffe Institute
Hilarov
Vladimir
vladimir.hilarov@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Damaskinskaya
Ekaterina
Kat.Dama@mail.ioffe.ru
St. Petersburg, Russian Federation
Fracture modeling with the discrete elements method
The discrete element method (DEM) is used to reveal the main features of fracture in materials with different degree of heterogeneity. It is shown that this method adequately describes the main properties of materials in the fracture process such as brittle and ductile behavior, two-staged nature of fracture in heterogeneous materials, heterogeneity of the spatial distribution of local internal stresses depending on the degree of material heterogeneity.
10.18721/JPM.161.139
538.951
materials fracture
Discrete Elements Method
heterogeneity
https://physmath.spbstu.ru/article/2023.63.39/
CNF
RUS
236-242
Matyushenko
Aleksey
alexey.matyushenko@gmail.com
0000-0001-9473-7430
Peter the Great St. Petersburg Polytechnic University
Golubkov
Valentin
golubkovvd@gmail.com
St. Petersburg, Russian Federation
0000-0002-2775-9864
Peter the Great St. Petersburg Polytechnic University
Garbaruk
Andrei
agarbaruk@mail.ru
Peter the Great St. Petersburg Polytechnic University
Strelets
Michael
strelets@mail.rcom.ru
St. Petersburg, Russian Federation
Application of machine learning approach for turbulence model improvement for flow around airfoil near stall conditions
The work is devoted to the improvement of the k-ω BSL turbulence model for the closure of Reynolds averaged Navier-Stokes (RANS) equations with the use of machine learning (ML) methods. The correction developed for this model enhances its accuracy in calculating airfoil flows at stall angles of attack. Testing of the modified model on the flows around different airfoils reveals its superiority for this type of flows. The results demonstrate efficiency of the ML methods for turbulence model improvement.
10.18721/JPM.161.140
532.517.4
machine learning
RANS-modeling
stall conditions
https://physmath.spbstu.ru/article/2023.63.40/
CNF
RUS
243-249
LLC “Numerical Calculations Russia”
Marakueva
Olga
o.marakueva@rescent.ru
St. Petersburg, Russian Federation
Keldysh Institute of Applied Mathematics of RAS
Duben
Alexey
aduben@keldysh.ru
Moscow, Russian Federation
Accuracy of flow simulation in a low-pressure turbine using a laminar-turbulent transition model
Nowadays, in order to decrease the aircraft engine weight, designers are forced to reduce the number of blades in the low-pressure turbine (LPT) since LPT is one of the heaviest components. The LPT operates in a wide range of Reynolds numbers, which can reach values of less than 105 at cruise mode. The correct modeling of the laminar-turbulent transition (LT) in the boundary layer of LPT blades is crucial for predicting the efficiency characteristics. The aim of the study is to evaluate the capabilities of several variants of the LT model for modeling the flow over the LPT blade. The SST γ – R͠ eθt model with different closing correlations, which control the transition onset and transition length, is considered. They are implemented in the research code NOISEtte. Validation of the realization is done on the basis of computations of flat plate flows from the ERCOFTAC database (experimental series T3). The flow in the turbine high-loaded cascade T106C is considered. Together with the experimental data, the results of scale-resolving simulation are used as the reference. The influence of the choice of empirical correlations for the γ – R͠ eθt model on the aerodynamic characteristics near the surface of the blade and at the outlet is evaluated. The results compared with those obtained using the same model and correlations within commercial code Numeca. The study revealed that the results of the same empirical correlations obtained using different flow solvers differ noticeably from each other.
10.18721/JPM.161.141
533.697
laminar-turbulent transition
transition model
low pressure turbine
EBR
https://physmath.spbstu.ru/article/2023.63.41/
CNF
RUS
250-254
Volgograd State University
Ivanchenko
Gennadii
genaivanchenko@volsu.ru
Volgograd, Russian Federation
Volgograd State University
Ten
Anastasia
ten.anastasia@volsu.ru
Volgograd, Russian Federation
Simulation of vibrations in hydrogenated diamond-like nanofilms
The paper calculates the phonon spectrum of diamane [1] in the framework of the Hamilton formalism. The geometric model of diamane is represented as a two-layer graphene, but each C-atom has sp3 hybridization of external electronic orbitals. The carbon atoms of one of the grapheme sublattices are covalently bound to the atoms of the second graphene layer, and the outer hydrogen atoms are covalently connected to the atoms of the second sublattice. A diamane unit cell contains two carbon atoms from a graphene unit cell and one hydrogen atom. When constructing the model, the curvature of the graphene plane was taken into account as a result of the addition of hydrogen atoms to it and the change in the hybridization of the external electronic orbitals of carbon atoms from sp2 to sp3. The interaction between hydrogen atoms was not taken into account.
10.18721/JPM.161.142
534-16
diamane
phonon spectrum
dispersion equation
https://physmath.spbstu.ru/article/2023.63.42/
CNF
RUS
255-261
Peter the Great St. Petersburg Polytechnic University
Guseva
Ekaterina
katia.guseva@inbox.ru
St. Petersburg, Russian Federation
Peter the Great St. Petersburg Polytechnic University
Shur
Mikhail
mshur@cfd.spbstu.ru
St. Petersburg, Russian Federation
0000-0001-7011-6197
Peter the Great St. Petersburg Polytechnic University
Stabnikov
Andrey
an.stabnikov@gmail.com
DLR (German Aerospace Center)
Ströer
Philip
philip.stroeer@dlr.de
Göttingen, Germany
Peter the Great St. Petersburg Polytechnic University
Travin
Andrey
atravin@cfd.spbstu.ru
St. Petersburg, Russian Federation
Zonal RANS-IDDES of asymmetric curved wake subjected to adverse pressure gradient
Results are presented of high-fidelity scale-resolving simulations of an asymmetric curved turbulent wake subjected to adverse pressure gradient based on the zonal RANS-IDDES approach to turbulence representation. The work is performed within the framework of a joint German-Russian project “Complex Wake Flows” and presents a continuation of the computational/experimental studies of the straight symmetric wakes carried out by the same team during 2017-2019. The addition of asymmetry and longitudinal curvature to the flow model made it more representative in terms of reproducing the real wakes behind the three-element high-lift wing configurations used during takeoff and landing of an aircraft. The reliability of the obtained results (both the mean flow parameters and the turbulent statistics) is supported by the grid-refinement study, whereas their comparison with the similar results of the RANS computations reveals a considerable discrepancy. This suggests the necessity of the improvement of the RANS models, which is planned for future work.
10.18721/JPM.161.143
532.517.4
turbulent wakes
adverse pressure gradient
scale-resolving simulations of turbulence
streamline curvature
https://physmath.spbstu.ru/article/2023.63.43/
CNF
RUS
262-268
Voronezh State University of Forestry and Technologies named after G.F. Morozov
Kamalova
Nina
rc@icmail.ru
Russia, 394087, St., Voronezh, Timiryazev, 8
Voronezh State University of Forestry and Technologies named after G.F. Morozov
Matveev
Nikolay
nmtv@vglta.vrn.ru
Russia, 394087, St. Voronezh, Timiryazev 8
Voronezh State University of Forestry and Technologies named after G.F. Morozov
Evsikova
Nataliya
natalyaevsikova@mail.ru
Russia, 394087, St., Voronezh, Timiryazev, 8
0000-0002-2148-1988
Voronezh State University of Forestry and Technologies named after G.F. Morozov
Lisitsyn
Viktor
viktor-lisicyn@yandex.ru
Voronezh, Russian Federation
Voronezh State University of Forestry and Technologies named after G.F. Morozov
Vnukova