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Reflection and refraction of bulk acoustic waves in piezoelectric crystals under the action of bias electric field and uniaxial pressure / S. I. Burkov [et al.] // Proceedings - IEEE Ultrasonics Symposium. - 2008. - Ст. 4803254. - P. 2161-2164, DOI 10.1109/ULTSYM.2008.0535 . - ISBN 1051-0117
Кл.слова (ненормированные):
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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Доп.точки доступа:
Burkov, S. I.; Sorokin, B. P.; Karpovich, A. A.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; IEEE International ultrasonics symposium(2008 ; Nov. ; 2-5 ; Beijing, China)
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Sorokin, B. P.
Influence of heterogeneous external fields on propagation of bulk acoustic waves in crystals / B. P. Sorokin, A. N. Marushyak, K. S. Aleksandrov // Proceedings - IEEE Ultrasonics Symposium. - 2008. - Ст. 4803313. - P. 1472-1475, DOI 10.1109/ULTSYM.2008.0358 . - ISBN 1051-0117
Кл.слова (ненормированные):
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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Доп.точки доступа:
Marushyak, A. N.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; IEEE International ultrasonics symposium(2008 ; Nov. ; 2-5 ; Beijing, China)
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The examination of frequency dependences of elastic waves velocities and their attenuation in heterogeneous mediums / P. P. Turchin [et al.] // Proceedings - IEEE Ultrasonics Symposium. - 2007. - Ст. 4409985. - P. 1637-1640, DOI 10.1109/ULTSYM.2007.412 . - ISBN 1051. - ISBN 1424413834; 9781424413836
Кл.слова (ненормированные):
Automation of measurings -- Ceramics -- Composites -- Elastic properties -- Physical acoustics -- Sound signal attenuation -- Elastic waves -- Elasticity -- Waves -- Automation of measurings -- Ceramics -- Composites -- Elastic properties -- Frequency dependences -- Frequency ranging -- Physical acoustics -- Sound signal attenuation -- Ultrasonics
Аннотация: The pulse - phase method for examination of ultrasonic waves propagation in materials, including mediums with high attenuation of a sound was designed. By automation methods of measurings the opportunity of determination the elastic waves velocities with an frequency range 100 kHz - 30 MHz with the resolution on frequency of 10-6 Hz is implemented. The phase method and a method of the frequency strobing for recording impulses are realized. These methods allow to define with precision not worse than 10-9 second the time of ultrasonic waves propagation. Requirements to the minimum linear dimensions of samples are restricted by the method sensitivity only. Velocities of elastic waves and their signal attenuation in ceramic and composites are measured. В© 2007 IEEE.

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Доп.точки доступа:
Turchin, P. P.; Parfenov, A. A.; Beletsky Jun, V. V.; Volzhentcev, A. A.; Ruzanov, V. M.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; IEEE International Ultrasonics symposium(2007 ; Oct. ; 28-31 ; New York, USA)
}
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Bulk acoustic waves propagation in Li2B4O7 piezoelectric crystals under the static uniaxial mechanical pressure / K. S. Aleksandrov [et al.] // Proceedings of the Annual IEEE International Frequency Control Symposium / Annual frequency control symposium (54 ; 2000 ; Jun. ; 7-9 ; Kansas, MO). - 2000. - P. 214-217. - Cited References: 8 . - ISBN 01616404
Кл.слова (ненормированные):
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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Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Turchin, P. P.; Sorokin, B. P.; Karpovich, A. A.; Nefedov, V. A.; Annual frequency control symposium(54 ; 2000 ; Jun. ; 7-9 ; Kansas, MO)
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Ferroelastic phase transition in Cs3Bi2I9 crystal / S. V. Melnikova [et al.] // Ferroelectrics, Letters Section. - 1996. - Vol. 20, Is. 5-6. - P. 163-167 . - ISSN 0731-5171
Кл.слова (ненормированные):
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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Доп.точки доступа:
Melnikova, S. V.; Мельникова, Светлана Владимировна; Shabanova, L. A.; Zaitsev, A. I.; Зайцев, Александр Иванович; Parshikov, S. A.; Ageev, O. A.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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Acoustooptic and elastic properties of NaBi(WO4)2 and LiBi(MoO4)2crystals / K. S. Aleksandrov [et al.] // Russ. Ultrason. - 1988. - Vol. 18, Is. 3. - P. 168-171 . - ISSN 0048-8828
Кл.слова (ненормированные):
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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Держатели документа:
USSR Acad of Sciences, Russian Federation

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Burkov, S. I.; Samkov, A. V.; Kholov, A.; Khafizov, S.Kh.; Shabanova, L. A.; Klevtsov, P. V.; Красноярский государственный университет
}
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Peculiarities of electromechanical properties of ferroelectric NH//4HSeO//4 / V. S. Krasikov [et al.] // Ferroelectrics. - 1983. - Vol. 54, Is. 1. - P. 431-434 . - ISSN 0015-0193
Кл.слова (ненормированные):
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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Доп.точки доступа:
Krasikov, V. S.; Zaitseva, M. P.; Shabanova, L. A.; Zrazhevsky, V. M.; Zherebtsova, L. I.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; European Meeting on Ferroelectricity(5 ; 1983 ; Sept. ; 26-30 ; Malaga, Sp)
}
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    Импульсные автоматизированные измерения скоростей упругих волн в кристаллах / П. П. Турчин [и др.] // Ползуновский вест. - 2011. - № 3/1. - С. 143-147. - Библиогр.: 17 назв. - Работа выполнена при финансовой поддержке РФФИ (проект N 09-02-98001-Сибирь) и гранта Президента РФ для поддержки ведущих научных школ РФ (НШ-4645.2010.2) . - ISSN 2072-8921
   Перевод заглавия: The pulse automated measurings of elastic waves velocities in monocrystals
Кл.слова (ненормированные):
echo-pulse method -- automated measurings -- elasticity -- monocrystals
Аннотация: На основе эхо-импульсного метода разработана автоматизированная экспериментальная установка для измерения скоростей упругих волн в кристаллах. Определены скорости акустических волн в пьезо- электрике La3Ga5SiO14 и сегнетоэластиках KPb2Br5 и RbPb2Br5
On basis of echo-pulsing method the automated experimental facility is developed for measurings of elastic waves velocities in crystals. The given method spots acoustic waves velocities in piezoelectric La3Ga5SiO14 and ferroelastics KPb2Br5 and RbPb2Br5.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Турчин, Павел Петрович; Turchin P.P.; Парфенов, Аркадий Анатольевич; Токарев, Н. А.; Нестеров, А. Е.; Тарасова, Александра Юрьевна; Александров, Кирилл Сергеевич; Aleksandrov, K. S.; Алтайский государственный технический университет им. И.И. Ползунова
}
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Mobility of Vacancies under Deformation and Their Effect on the Elastic Properties of Graphene / A. S. Fedorov [et al.] // J. Exp. Theor. Phys. - 2011. - Vol. 112, Is. 5. - P. 820-824, DOI 10.1134/S1063776111040042. - Cited References: 35 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
WALLED CARBON NANOTUBES
   INITIO MOLECULAR-DYNAMICS
   AB-INITIO
   GRAPHITE SURFACES
   DEFECTS
   IRRADIATION
   HYDROGEN
   POINTS
Кл.слова (ненормированные):
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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Держатели документа:
[Fedorov, A. S.
Popov, Z. I.
Kuzubov, A. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Fedorov, D. A.
Anan'eva, Yu. E.
Eliseeva, N. S.
Kuzubov, A. A.] Siberian Fed Univ, Krasnoyarsk 660028, Russia
ИФ СО РАН
Siberian Branch, Kirensky Institute of Physics, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660028, Russian Federation

Доп.точки доступа:
Fedorov, A. S.; Федоров, Александр Семенович; Fedorov, D. A.; Федоров, Дмитрий Александрович; Popov, Z. I.; Попов, Захар Иванович; Anan'eva, Y. E.; Eliseeva, N. S.; Kuzubov, A. A.; Кузубов, Александр Александрович
}
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10.

Val'kov, V. V.
The magnetoelastic mechanism of singlet phase formation in a two-dimensional quantum antiferromagnet / V. V. Val'kov, V. A. Mitskan, G. A. Petrakovskii // J. Exp. Theor. Phys. - 2006. - Vol. 102, Is. 2. - P. 234-247, DOI 10.1134/S106377610602004X. - Cited References: 18 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
GROUND-STATE
   SPIN
   TRANSITION
   CUGEO3
   MODEL
Кл.слова (ненормированные):
Crystal lattices -- Elasticity -- Mathematical models -- Oscillations -- Phase diagrams -- Phase transitions -- Quantum theory -- Two dimensional -- Atomic representation -- Magnetoelastic mechanism -- Quantum antiferromagnets -- Singlet phase formation -- Antiferromagnetic materials
Аннотация: A model describing the second-order phase transition with respect to the magnetoelastic coupling parameter from the anti ferromagnetic (AFM) to the singlet state in a two-dimensional quantum magnet on a square lattice is proposed. The spectrum of elementary excitations in the singlet and AFM phases is calculated using an atomic representation, and the evolution of transverse and longitudinal branches of this spectrum is studied in the vicinity of the transition point. It is established that the AFM to singlet phase transition is related to softening of the longitudinal branch of oscillations. In the singlet phase, the gap plays the role of a parameter characterizing the distance to the phase transition point. It is shown that the spectrum of transverse oscillations in the AFM phase corresponds to the Goldstone boson. Based on an analysis of the stability of the spectrum of elementary excitations, a phase diagram is constructed that determines the regions of the existence of phases with plaquette-deformed lattices.

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Держатели документа:
Russian Acad Sci, Siberian Div, Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660075, Russia
ИФ СО РАН
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State Technical University, Krasnoyarsk, 660074, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660075, Russian Federation

Доп.точки доступа:
Mitskan, V. A.; Мицкан, Виталий Александрович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Вальков, Валерий Владимирович
}
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