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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Burkov S. I., Samkov A. V., Kholov A., Khafizov S.Kh., Shabanova L. A., Klevtsov P. V.
Заглавие : Acoustooptic and elastic properties of NaBi(WO4)2 and LiBi(MoO4)2crystals
Коллективы : Красноярский государственный университет
Место публикации : Russ. Ultrason./ изд. орг. . - 1988. - Vol. 18, Is. 3. - P.168-171. - ISSN 0048-8828
Ключевые слова (''Своб.индексиров.''): acoustooptical devices--materials--elasticity--lithium compounds--sodium compounds--acoustooptic properties--bulk acoustic waves--elastic properties--crystals
Аннотация: In recent years interest has been shown in crystals with the scheelite structure (point symmetry group 4/m) as promising materials for acoustooptic devices. However, nearly all the work done so far has been on the NaBi(MoO4)2 and PbMoO4 crystals. In this paper the authors give the results of a study of the elastic and acoustooptic properties of NaBi(WO4)2 and LiBi(MoO4)2 crystals from a series of isomorphic compounds with the scheelite structure carried out in order to determine the extent of the changes in the elastic and acoustooptic properties of this series of crystals when the structural elements are changed.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Aleksandrov K. S., Turchin P. P., Sorokin B. P., Karpovich A. A., Nefedov V. A.
Заглавие : Bulk acoustic waves propagation in Li2B4O7 piezoelectric crystals under the static uniaxial mechanical pressure
Коллективы : Annual frequency control symposium
Место публикации : Proceedings of the Annual IEEE International Frequency Control Symposium/ Annual frequency control symposium (54 ; 2000 ; Jun. ; 7-9 ; Kansas, MO). - 2000. - P.214-217. - ISBN 01616404
Примечания : Cited References: 8
Ключевые слова (''Своб.индексиров.''): acoustic wave transmission--acoustic wave velocity--elasticity--lithium compounds--mathematical models--permittivity--piezoelectricity--pressure effects--single crystals--electromechanical constants--piezoelectric crystal--piezoelectric materials
Аннотация: The influence of uniaxial mechanical stresses on bulk acoustic waves velocity in piezoelectric crystals Li2B4O7 has been investigated. Electromechanical constants have determined.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Melnikova S. V., Shabanova L. A., Zaitsev A. I., Parshikov S. A., Ageev O. A., Aleksandrov K. S.
Заглавие : Ferroelastic phase transition in Cs3Bi2I9 crystal
Место публикации : Ferroelectrics, Letters Section. - 1996. - Vol. 20, Is. 5-6. - P.163-167. - ISSN 0731-5171
Ключевые слова (''Своб.индексиров.''): birefringence--cesium compounds--crystal symmetry--crystals--differential scanning calorimetry--elasticity--ferroelectricity--permittivity--stiffness--twinning--cesium bismuth iodide--elastic constant--elastic stiffness--ferroelastic phase transition--phase transitions
Аннотация: Phase transition (PT) was found in Cs3Bi2I9 single crystal at T0=223 K. Optical birefringence, dielectric and elastic constants and differential scanning calorimetry have been studied. It was found that birefringence ?nc and twinning picture appeared on (001) - and (100) - plates below T0, as well as softening of elastic stiffness C44 above T0. It allows to classify the PT as proper ferroelastic one with symmetry change 6/mmm - 2/m. В© 1996 OPA (Overseas Publishers Association) Amsterdam B.V. Published in The Netherlands under license by Gordon and Breach Science Publishers SA.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chernozatonskii L.A., Sorokin P.B., Kuzubov A.A., Kvashnin A.G., Kvashnin D.G., Avramov P.V., Yakobson B.I., Sorokin B.P.
Заглавие : Influence of Size Effect on the Electronic and Elastic Properties of Diamond Films with Nanometer Thickness
Место публикации : J. Phys. Chem. C. - 2011. - Vol. 115, Is. 1. - P.132-136. - JAN 13. - ISSN 1932-7447, DOI 10.1021/jp1080687
Примечания : Cited Reference Count: 37. - Гранты: L.A.C. was supported by the Russian Academy of Sciences, program No. 21 and by the Russian Foundation for Basic Research (project no. 08-02-01096). P.B.S. and B.I.Y. acknowledge support by the Office of Naval Research (MURI project). P.V.A. and P.B.S. also acknowledge the collaborative RFBR-JSPS grant no. 09-02-92107-R Phi. We are grateful to the Joint Supercomputer Center of the Russian Academy of Sciences for the possibility of using a cluster computer for quantum chemical calculations. The geometry of all presented structures was visualized by commercial Chem-Craft software.Финансирующая организация: Russian Academy of Sciences [21]; Russian Foundation for Basic Research [08-02-01096]; Office of Naval Research (MURI); RFBR-JSPS [09-02-92107-RPhi]
Предметные рубрики: REVERSIBLE HYDROGENATION
GRAPHENE
GRAPHANE
Atomic structure
Band gaps
Diamond nanocrystals
Elastic properties
Electronic band structure calculation
Energy stability
Experimental data
Hydrogen atoms
Nanometer thickness
Size effects
Theoretical result
Diamond films
Elasticity
Carbon films
Ключевые слова (''Своб.индексиров.''): atomic structure--band gaps--diamond nanocrystals--elastic properties--electronic band structure calculation--energy stability--experimental data--hydrogen atoms--nanometer thickness--size effects--theoretical result--diamond films--elasticity--carbon films
Аннотация: The atomic structure and physical properties of few-layered 111 oriented diamond nanocrystals (diamanes), covered by hydrogen atoms from both sides, are studied using electronic band structure calculations. It was shown that energy stability linearly increases upon increasing of the thickness of proposed structures. All 2D carbon films display direct dielectric band gaps with nonlinear quantum confinement response upon the thickness. Elastic properties of diamanes reveal complex dependence upon increasing of the number of 111 layers. All theoretical results were compared with available experimental data.The atomic structure and physical properties of few-layered 〈111〉 oriented diamond nanocrystals (diamanes), covered by hydrogen atoms from both sides, are studied using electronic band structure calculations. It was shown that energy stability linearly increases upon increasing of the thickness of proposed structures. All 2D carbon films display direct dielectric band gaps with nonlinear quantum confinement response upon the thickness. Elastic properties of diamanes reveal complex dependence upon increasing of the number of 〈111〉 layers. All theoretical results were compared with available experimental data. © 2010 American Chemical Society.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedorov A. S., Fedorov D. A., Popov Z. I., Anan'eva Y. E., Eliseeva N. S., Kuzubov A. A.
Заглавие : Mobility of Vacancies under Deformation and Their Effect on the Elastic Properties of Graphene
Разночтения заглавия :авие SCOPUS: Mobility of vacancies under deformation and their effect on the elastic properties of graphene
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 112, Is. 5. - P820-824. - ISSN 1063-7761, DOI 10.1134/S1063776111040042
Примечания : Cited References: 35
Предметные рубрики: WALLED CARBON NANOTUBES
INITIO MOLECULAR-DYNAMICS
AB-INITIO
GRAPHITE SURFACES
DEFECTS
IRRADIATION
HYDROGEN
POINTS
Ключевые слова (''Своб.индексиров.''): ab initio--applied strain--density-functional methods--elastic properties--graphene sheets--linear dependence--potential barriers--transition state theories--young's modulus--elasticity--graphene
Аннотация: The effect of isolated vacancies on the elastic properties of a graphene sheet has been investigated by the ab initio density functional method. An almost inverse linear dependence of the Young's modulus on the concentration of vacancies has been revealed. The height of potential barriers for the motion of vacancies in various directions has been calculated as a function of various independent applied strains. The velocity of vacancies at various temperatures has been calculated as a function of applied strains using the transition state theory. DOI: 10.1134/S1063776111040042
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Nikolaev S. V., Ovchinnikov S. G.
Заглавие : Magnetic properties and spin crossover in transition metal oxides with d5 Ions at high pressures
Место публикации : J. Exp. Theor. Phys. - 2019. - Vol. 129, Is. 6. - P.1062-1069. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776119120185
Примечания : Cited References: 33. - This study was supported by the Russian Science Foundation (project no. 18-12-00022)
Аннотация: We analyze the influence of cooperative effects on the magnetic properties and spin crossover between the high-spin (HS) term S = 5/2 and low-spin (LS) term S = 1/2 in Mott–Hubbard dielectrics with 3d5 ions under high pressures. Two cooperation mechanisms (superexchange interaction and effective interaction via the elastic system) are considered. The sign of the exchange interaction changes because of the crossover from the antiferromagnetic in the HS state to the ferromagnetic in the LS state. In view of the large difference between the ionic radii of the HS and LS states, the systems with spin crossover acquire an additional strong coupling via the elastic system. Using the Hubbard operator representation and considering the electronic states of the two terms simultaneously, we obtain the effective Hamiltonian with allowance for the cooperative effects. The magnetic phase diagram and the spin crossover are investigated in the mean field approximation. It is shown that the inclusion of cooperative effects at low temperatures leads to a first-order phase transition between the antiferromagnetic HS state and the ferromagnetic LS state. At higher temperatures, more complicated sequences of phase transitions are possible upon an increase in pressure, including the HS paramagnet–HS antiferromagnet–LS paramagnet and HS antiferromagnet–LS paramagnet–LS ferromagnet transitions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krasikov V. S., Zaitseva M. P., Shabanova L. A., Zrazhevsky V. M., Zherebtsova L. I., Aleksandrov K. S.
Заглавие : Peculiarities of electromechanical properties of ferroelectric NH//4HSeO//4
Коллективы : European Meeting on Ferroelectricity
Место публикации : European Meeting on Ferroelectricity (5 ; 1983 ; Sept. ; 26-30 ; Malaga, Sp). Ferroelectrics. - 1983. - Vol. 54, Is. 1. - P.431-434. - ISSN 0015-0193
Ключевые слова (''Своб.индексиров.''): elasticity--piezoelectricity--ammonium hydroselenate--electromechanical properties--phase transitions--ferroelectric materials
Аннотация: Dielectric, piezoelectric and elastic properties of NH//4HSeO//4 crystal were studied in temperature range 180-300 K. Some anomalies of the properties near T//c equals 250 K and T//i equals 261 K were found. These anomalies are caused by high dielectric permeability along b-axis above T//i and the symmetry-forbidden piezoelectric coupling. An effort of phenomenological description of the successive phase transitions is made.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrilyuk A. P., Isaev I. L., Gerasimov V. S., Karpov S. V.
Заглавие : Physical principles of the formation of a nanoparticle electric double layer in metal hydrosols
Место публикации : Colloid Polym. Sci. - 2020. - Vol. 298, Is. 1. - P.1-7. - ISSN 0303-402X, DOI 10.1007/s00396-019-04573-8. - ISSN 1435-1536 (eISSN)
Примечания : Cited References: 25. - The reported research was funded by the Russian Foundation for Basic Research and the government of the Krasnoyarsk territory, Krasnoyarsk Regional Fund of Science, grant No 18-42-243023, the RF Ministry of Education and Science, the State contract with Siberian Federal University for scientific research in 2017–2019.
Аннотация: The Brownian dynamics method is employed to study the formation of an electrical double layer (EDL) on the metal nanoparticle (NP) surface in hydrosols during adsorption of electrolyte ions from the interparticle medium. Also studied is the charge accumulation by NPs in the Stern layer. To simulate the process of the formation of EDL, we took into account the effect of image forces and specific adsorption, dissipative and random forces, and the degree of hydration of adsorbed ions on the EDL structure. The employed model makes it possible to determine the charge of NPs and the structure of EDL. For the first time, the charge of both the diffuse part of EDL and the dense Stern layer has been determined. A decrease in the electrolyte concentration (below c ˂ 0.1 mol/l) has been found to result in dramatic changes in the formation of the Stern layer.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Burkov S. I., Sorokin B. P., Karpovich A. A., Aleksandrov K. S.
Заглавие : Reflection and refraction of bulk acoustic waves in piezoelectric crystals under the action of bias electric field and uniaxial pressure
Коллективы : IEEE International ultrasonics symposium
Место публикации : Proceedings - IEEE Ultrasonics Symposium. - 2008. - Ст.4803254. - P.2161-2164. - ISBN 1051-0117, DOI 10.1109/ULTSYM.2008.0535
Ключевые слова (''Своб.индексиров.''): bias electric field--bulk elastic wave--mechanical stress--piezoelectric crystal--reflection--refraction--bias electric field--bulk acoustic waves--bulk elastic wave--mechanical stress--piezoelectric crystal--piezoelectric crystals--uniaxial pressures--acoustic wave reflection--acoustics--crystals--elastic waves--elasticity--electric field measurement--electric fields--piezoelectric materials--piezoelectric transducers--piezoelectricity--refraction--soil structure interactions--stresses
Аннотация: Main theory results concerned with bulk elastic wave reflection/refraction on the boundary between two piezoelectric crystals subjected to the action of bias electric field or mechanical stress have presented. Some calculations for LiNbO3 and Bi12GeO20 crystals have made. В©2008 IEEE.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sorokin B. P., Marushyak A. N., Aleksandrov K. S.
Заглавие : Influence of heterogeneous external fields on propagation of bulk acoustic waves in crystals
Коллективы : IEEE International ultrasonics symposium
Место публикации : Proceedings - IEEE Ultrasonics Symposium. - 2008. - Ст.4803313. - P.1472-1475. - ISBN 1051-0117, DOI 10.1109/ULTSYM.2008.0358
Ключевые слова (''Своб.индексиров.''): bulk elastic wave--non-homogeneous mechanical loading--phase velocity--wave surface--bulk acoustic waves--bulk elastic wave--bulk waves--external fields--non-homogeneous--non-homogeneous mechanical loading--numerical calculation--small amplitude--wave surface--acoustic fields--crystals--elastic waves--elasticity--phase velocity--silicon compounds--soil structure interactions--waves--velocity
Аннотация: Formulas describing the influence of nonhomogeneous pressure on propagation of bulk waves in crystals have derived. Phase velocity for small amplitude waves in Bi12SiO20 crystal the action of non-homogeneous pressure has been . Under those conditions the behavior of the wave has researched. Numerical calculation of phase velocity of and their directions propagation changing have obtained. В©2008 IEEE.
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