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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vtyurin A. N., Krylov A. S., Goryainov S. V., Krylova S. N., Oreshonkov A. S., Voronov V. N.
Заглавие : A raman study of hydrostatic pressure induced phase transitions in Rb2KInF6 crystals
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 5. - P.934-936. - ISSN 1063-7834, DOI 10.1134/S1063783412050472
Примечания : Cited References: 16. - This study was supported by the Russian Foundation for Basic Research (project nos. 11-02-98002-r_sibir' and 09-02-00062), the Siberian Branch of the Russian Academy of Sciences (integration project no. 101), and the Council on Grants from the President of the Russian Federation (grant no. HSh-4645.2010.2).
Предметные рубрики: LATTICE-DYNAMICS
ELPASOLITES
SPECTRA
Аннотация: The Raman spectra of the elpasolite (Rb2KInF6) crystal have been studied in the pressure range from 0 to 5.3 GPa at a temperature of 295 K. A phase transition at a pressure of approximately 0.9 GPa has been found. An analysis of the variations in the spectral parameters has led to the conclusion that the phase transition to a distorted phase is accompanied by the doubling of the volume of the primitive cell of the initial cubic phase. Numerical calculations of the lattice dynamics in the Rb2KInF6 crystal have been performed. The numerical simulation has established that the phase transition at a pressure of 0.9 GPa is associated with condensation of the F (lg) mode. A probable high-pressure phase is the phase with space group C2/m.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F., Shepov V. N.
Заглавие : A study of the microwave dielectric permittivity of liquid crystals in electric and magnetic fields
Место публикации : Tech. Phys. - 1998. - Vol. 43, Is. 1. - P.105-109. - ISSN 1063-7842, DOI 10.1134/1.1258946
Примечания : Cited References: 8
Аннотация: A microwave detector based on a self-sustained oscillator circuit is proposed as a means to investigate the real and imaginary components of the dielectric permittivity of liquid crystals in external electric and magnetic fields. Results are given for measurements of a 500 MHz oscillator frequency for two types of nematic crystals, 5CBP and MBBA. Fundamental regularities are identified in the behavior of the microwave dielectric permittivity of samples in electric and magnetic fields. It is shown that the minimum of the high-frequency dielectric loss in liquid crystals correspond to a situation in which the long axes of the molecules are oriented parallel to the direction of the microwave electric field. (C) 1998 American Institute of Physics. [S1063-7842(98)02201-6].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Petrakovskii G. A.
Заглавие : Metal-insulator transition, magnetoresistance, and magnetic properties of 3d-sulfides (Review)
Место публикации : Low Temp. Phys. - 2006. - Vol. 32, Is. 8-9. - P.725-734. - ISSN 1063-777X, DOI 10.1063/1.2219495; \b Физика низких температур
Примечания : Cited References: 74
Предметные рубрики: GIANT-MAGNETORESISTANCE
PHASE-TRANSITION
ALPHA-MNS
COLOSSAL MAGNETORESISTANCE
SINGLE-CRYSTALS
FES-MNS
SULFIDES
FERROMAGNETISM
SEMICONDUCTORS
TEMPERATURE
Аннотация: The results of a study of the transport and magnetic properties of some sulfides of 3d elements are reported. The concentration transitions with a change of conductivity type and a change of magnetic order are considered, and the features of the colossal magnetoresistance in FexMn1-xS and CuVxCr1-xS2 solid solutions are discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : EDELMAN I. S., GALANOV E. K., KOKOV I. T., MALAKHOVSKII A. V., ANISTRATOV A. T.
Заглавие : ABSORPTION-SPECTRA AND FARADAY-EFFECT IN CS2NANDCL6 AND CS2NAPRCL CRYSTALS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1985. - Vol. 27, Is. 11. - P3467-3470. - ISSN 0367-3294
Примечания : Cited References: 8
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Zamkov A. V., Zaitsev A. I., Turchin P. P., Sysoev A. M., Parfenov A. A.
Заглавие : Acoustical and acoustooptical properties of lead tetraborate single crystals
Место публикации : Phys. Solid State. - 2004. - Vol. 46, Is. 9. - P.1637-1638. - ISSN 1063-7834, DOI 10.1134/1.1799178
Примечания : Cited References: 6
Предметные рубрики: STRONTIUM
Аннотация: The velocities of bulk acoustic waves and the acoustooptical Q factors M-2 are measured. The results of these measurements are used for calculating the photoelastic coefficients of a lead tetraborate single crystal. (C) 2004 MAIK "Nauka/Interperiodica".
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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 журнала
Шифр издания :
Автор(ы) : PETRAKOVSKII G. A., SOSNIN V. M., RUDENKO V. V., RYBNIKOVA S. M.
Заглавие : AFMR LINEWIDTH STUDY OF FEBO3 CRYSTALS GROWN FROM SOLUTION-MELTING
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1984. - Vol. 26, Is. 12. - P3720-3722. - ISSN 0367-3294
Примечания : Cited References: 6
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Beznosikov B. V.
Заглавие : Architecture and properties of perovskite-like crystals
Коллективы : USA-CIS-Baltic Seminar on Ferroelectricity
Место публикации : Ferroelectrics: Gordon Breach Sci Publ Ltd, 1999. - Vol. 226, Is. 1-4. - P.1-9. - ISSN 0015-0193, DOI 10.1080/00150199908230285
Примечания : Cited References: 9
Ключевые слова (''Своб.индексиров.''): perovskites--perovskite-like crystals--new representatives of ruddlesden-popper's phases--new representatives of ruddlesden-popper's phases--perovskite-like crystals--perovskites
Аннотация: A variety of the known structures of perovskite-like crystals including cation- and anion-deficient phases were considered as the intergrowth systems of slabs containing n-layers (n = 1,2, 3,...infinity) of corner-linked octahedra BX6, pyramids EX5 or square-planar nets BX4 (B-cation, X- anion) linked by intermediate blocks of different types.([1- 3]) Some new structural types and new representatives of ferroelectrics, ferroelastics and HTSC's can be constructed on this basis. The prognosis of new possible representatives in Ruddlesden-Popper's family is discussed.A variety of the known structures of perovskite-like crystals including cation- and anion-deficient phases were considered as the intergrowth systems of slabs containing n-layers (n = 1, 2, 3, . . . ?) of corner-linked octahedra BX6, pyramids BX5 or square-planar nets BX4 (B-cation, X-anion) linked by intermediate blocks of different types.[1-3] Some new structural types and new representatives of ferroelectrics, ferroelastics and HTSC's can be constructed on this basis. The prognosis of new possible representatives in Ruddlesden-Popper's family is discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Beznosikov B. V.
Заглавие : Architecture of perovskite-like crystals
Место публикации : Crystallogr. Rep. - 1997. - Vol. 42, Is. 4. - P.556-566. - ISSN 1063-7745
Аннотация: The structures of the well-known perovskite-like crystals, including stoichiometric and both cation- and anion-dencient compounds, are considered as intergrowth systems of stacks consisting either of n layers (n = 1 - ?) connected via the vertices of the BX6 octahedra or of combinations of layers of octahedra, BX5 pyramids, and planar networks of BX4 squares with intermediate block layers of various types. The classification of stacks and block layers in these structures is suggested. Based on this classification, the known structure types are considered and new structure types, including various possible superconductor structures, are predicted.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Reshchikova L. M., Beznosikov B. V.
Заглавие : Behaviour of the elastic constants of KMnF3 single crystals near the transition of puckering
Место публикации : Phys. Status Solidi. - 1966. - Vol. 17, Is. 1. - P.K17-K20. - ISSN 0370-1972, DOI 10.1002/pssb.19660180149
Примечания : Cited References: 7
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Shabanova L. A., Zinenko V. I.
Заглавие : Elastic constants of MgF2 single crystals
Место публикации : Phys. Status Solidi. - 1969. - Vol. 33, Is. 1. - P.K1-K3. - ISSN 0370-1972, DOI 10.1002/pssb.19690330154
Примечания : Cited References: 7
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Beznosikov B. V.
Заглавие : Hierarchies of perovskite-like crystals (Review)
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1997. - Vol. 39, Is. 5. - P.695-715. - ISSN 1063-7834, DOI 10.1134/1.1130120
Примечания : Cited References: 143
Предметные рубрики: CU-O SYSTEM
HIGH-PRESSURE SYNTHESIS
SUPERCONDUCTING COPPER OXIDES
STRUCTURAL PHASE-TRANSITIONS
NEUTRON POWDER DIFFRACTION
SINGLE-CRYSTAL
X-RAY
CUPRATE SUPERCONDUCTORS
DIELECTRIC-PROPERTIES
HOMOLOGOUS SERIES
Аннотация: A system of mutual relationships (a hierarchy) is constructed between various perovskite-like crystal structures based on available structural data. All the perovskite-like structures are characterized by a common indicator of their relationship-the presence of layers, stacks, or frameworks made up of BX6 octahedra linked at their vertices (where B is a cation, X is an anion) or fragments of octahedra in the form of BX5 pyramids or BX4 squares in anion-deficient compounds. In layered structures, these stacks are joined to each other by various intermediate blocks. It is well known that one homological series of compounds is constructed by increasing the number of layers in a stack while preserving the same kind of connecting block. Crystals of various series that contain identical stacks (but different blocks of one or two types) can also be related to one another via this feature. The hierarchical system includes compounds with small distortions in their structures for various reasons. (C) 1997 American Institute of Physics.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Bartolome J.
Заглавие : Octahedral tilt phases in perovskite-like crystals with slabs containing an even number of octahedral layers
Место публикации : Journal of Physics: Condensed Matter. - 1994. - Vol. 6, Is. 40. - Ст.013. - P.8219-8235. - ISSN 0953-8984, DOI 10.1088/0953-8984/6/40/013
Аннотация: The possible combinations of different octahedral tilts are considered for layered crystals having an even number of octahedral layers in perovskite-like slabs. A simple method to determine the resultant space-group symmetry is proposed, and the distorted phases are enumerated, both for a single kind of tilt around axes of the initial structure G 0=I4/mmm and for superpositions of different tilts in the slabs. Some of the tilt systems correspond to symmetry changes due to definite irreducible representations of G 0. In the single-layered crystals, l=1, A 2BX 4. Some of the representations correspond to lattice modes observed experimentally. No such modes have been found yet for even-layered (l=2n) crystals. A comparison with known experimental data is performed. The data obtained can be used for the proposition of 'trial models' in the course of structural analysis of related crystals.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S.
Заглавие : Phase transition due to octahedral tilts in several families of crystals related to perovskite
Коллективы : Japanese-Soviet symposium on ferroelectricity, Советско-японский симпозиум по сегнетоэлектричеству
Место публикации : Journal of the Physical Society of Japan. - 1980. - Vol. 49, Supplement B. - P.60-63. - ISSN 0031-9015
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Beznosikov B. V.
Заглавие : Phase transitions in crystals related to α-K2SO4
Разночтения заглавия :: Phase-transitions in crystals RELATED to alpha-K2SO4
Место публикации : Ferroelectrics: GORDON BREACH SCI PUBL LTD, 1991. - Vol. 117, Is. 1. - P.331-345. - ISSN 0015-0193, DOI 10.1080/00150199108222426
Примечания : Cited References: 20
Аннотация: Sequences of phase transitions (PT's) related to α-K2SO4 prototype (G0) are considered as the ordered phases mainly due to orientational ordering of tetrahedral groups. Possibilities of statistical models with four and twelve states in G0 are compared. Last model allows to describe PT's from G0 to all known relative structures including K2MoO4-, Sr2GeS4- and Na2SO4III-types. PT's in CsLiCrO4, Cs2CdI4 and sequence of PT's in KLiSO4 are considered as examples.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S.
Заглавие : Phase-transitions and distortions of the structure in the family of crystals related to alpha-k2so
Место публикации : Kristallografiya. - 1993. - Vol. 38, Is. 1. - P.128-139. - ISSN 0023-4761; Crystallogr. Rep.
Примечания : Cited References: 38
Предметные рубрики: X-RAY
EXPECTED STRUCTURES
A2BX4 COMPOUNDS
TEMPERATURE
(NH4)2BEF4
CHEMISTRY
DISORDER
SYMMETRY
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Ivanov Y. N., Schafer A. D.
Заглавие : Spectroscopic investigation of phase transitions in CsLiMoO//4 crystals.
Коллективы : European Meeting on Ferroelectricity
Место публикации : European Meeting on Ferroelectricity (5 ; 1983 ; Sept. ; 26-30 ; Malaga, Sp). Ferroelectrics. - 1983. - Vol. 55, Is. 1. - P.671-674. - ISSN 0015-0193
Ключевые слова (''Своб.индексиров.''): crystals - structure--magnetic resonance--spectroscopy, raman--cesium lithium molybdate--phase transitions--ferroelectric materials
Аннотация: Raman and NMR spectra in cubic and two distorted phases of CsLiMoO//4 have been studied. Phase transitions in the crystal are shown to belong to order-disorder type.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Ivanov Y. N., Schafer A. D.
Заглавие : Spectroscopic investigation of phase-transitions in CsLiMoO4 crystals
Место публикации : Ferroelectrics: GORDON BREACH SCI PUBL LTD, 1984. - Vol. 55, Is. 1. - P.671-674. - ISSN 0015-0193, DOI 10.1080/00150198408015320
Примечания : Cited References: 4
Аннотация: Raman and NMR spectra in cubic and two distorted phases of CsLiMoO4 have been studied. Phase transitions in the crystal are shown to belong to order-disorder type.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S.
Заглавие : Structural aspects of phase transitions in crystals
Коллективы : European Meeting on Ferroelectricity
Место публикации : European Meeting on Ferroelectricity (5 ; 1983 ; Sept. ; 26-30 ; Malaga, Sp). Ferroelectrics. - 1983. - Vol. 53, Is. 1. - P.153-154. - ISSN 0015-0193, DOI 10.1080/00150198408245044
Ключевые слова (''Своб.индексиров.''): ferroelectric materials--lithium compounds - x-ray analysis--phase transitions--crystals
Аннотация: Modern X-ray methods obtain in a short time the complete set of structural amplitudes and solve a crystal structure at constant temperatures (or pressures) on both sides of phase transition. A review of structure investigations with the crystals having the common formula Me prime Me double prime BX//4 (Me prime , Me double prime equals Li, Na, K, Rb, Cs, NH//4 and H; BX//4**2** plus equals SO//4, SeO//4, BeF//4, ZnCl//4) is presented.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Bartolome J.
Заглавие : Structural distortions in families of perovskite-like crystals
Место публикации : Phase Transit.: TAYLOR & FRANCIS LTD, 2001. - Vol. 74, Is. 3. - P.255-335. - ISSN 0141-1594, DOI 10.1080/01411590108228754
Примечания : Cited References: 262
Предметные рубрики: LOW-TEMPERATURE PHASE
INELASTIC-NEUTRON-SCATTERING
POWDER PROFILE REFINEMENT
MII = CO
X-RAY
RAMAN-SCATTERING
ORDERED PEROVSKITE
RHOMBOHEDRAL PEROVSKITES
RB2KMIIIF6 ELPASOLITES
MAGNETIC-PROPERTIES
Ключевые слова (''Своб.индексиров.''): structural phase transitions--perovskites--perovskite-like crystals--group theoretical classification
Аннотация: The crystallographic and group theoretical analysis of the structural phase transitions in perovskite and perovskite-like crystals is reviewed. We include ABX(3) perovskites and their relative crystals of ReO3 type (G(0) = O-h(1)), elpasolites, cryolites and their relatives (G(0) = O-h(5)) layered crystals of TIAIF(4) series (G(0) = D-4h(1)), Aurivillius and Ruddlesden-Popper series (G(0) = D-4h(17)). The structures in their initial phase G(0) often contain n layers (n = 1, 2,3) of vertex linked octahedra. The distorted phases produced by one kind of tilt and by superposition of tilts in the slabs are enumerated. Most of the tilts correspond to symmetry changes, which can be associated to definite librational lattice modes irreducible representations of the G(0) group. The softening of modes associated to the PT has been found experimentally in many perovskites, elpasolites and layered crystals with n = 1. In contrast, no such soft modes have been found yet for even-layered (n = 2) crystals. Examples of successive phase transitions due to the superposition of tilts in these types of crystals have been collected.
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