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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Aleksandrov K. S., Pozdnyakova L. A., Beznosikov B. V., Anistratov A. T., Flerov I. N.
Заглавие : Investigation of the phase transitions in crystals ABCl3 with the perovskite structure
Коллективы : International meeting on ferroelectricity
Разночтения заглавия :: Stadies of the phase transitions in crystals ABCl3 with the perovskite structure
Место публикации : Abstracts of IMF-III. - 1973
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Melnikova S.V., Flerov I. N., Anistratov A. T.
Заглавие : Thermodynamical description of O-H(1)-]G1-]G2-]G3 successive phase-transitions in ABCL3 perovskite structure crystals
Место публикации : Fiz. Tverd. Tela. - 1981. - Vol. 23, Is. 12. - P.3570-3575. - ISSN 0367-3294
Примечания : Cited References: 10
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Beznosikov B. V., Anistratov A. T., Aleksandrov K. S.
Заглавие : Crystal-chemistry, phase-transitions, and physical-properties of halide crystals with perovskite-like structure
Место публикации : Inorg. Mater. - 1982. - Vol. 18, Is. 10. - P.1406-1411. - ISSN 0020-1685
Примечания : Cited References: 13
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : MELNIKOVA S. V., ANISTRATOV A. T.
Заглавие : ELECTROOPTICAL PROPERTIES OF SOME ABCL3 PEROVSKITE STRUCTURE TYPE CRYSTALS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1984. - Vol. 26, Is. 6. - P1906-1908. - ISSN 0367-3294
Примечания : Cited References: 6
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Voronov V. N., Aleksandrov K. S.
Заглавие : Steric factor effects on ionic mobility processes in perovskite-like structure compounds
Место публикации : Fiz. Tverd. Tela: Mezhdunarodnaya kniga, 1985. - Vol. 27, Is. 7. - P.1968-1976. - ISSN 0367-3294
Примечания : Cited References: 32
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S.
Заглавие : Successive structural phase-transitions in layered perovskite-like crystals .1. Crystals of the TLALF4 type
Место публикации : Kristallografiya: Международная книга, 1987. - Vol. 32, Is. 3. - P.661-672. - ISSN 0023-4761; Crystallogr. Rep.
Примечания : Cited References: 28
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Aleksandrov K. S., Beznosikov B. V., Vasil'ev A. D., Kruglik A. I.
Заглавие : Crystallographic classification of distortions in layer perovskite-like crystals of K2NiF4 type. Structural phase-transition in Rb2CdCl4
Коллективы : European crystallographic meeting
Место публикации : Phase Transit. - 1987. - Vol. 8, Is. 4. - P.352. - ISBN 0141-1594
Примечания : Cited References: 3
Предметные рубрики: Condensed Matter
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Kokov I. T., Melnikova S. V., Misyul S. V., Flerov I. N.
Заглавие : Study of structural phase-transitions in the double-layer perovskite-like crystal Rb3CD2Cl7
Место публикации : Fiz. Tverd. Tela: Mezhdunarodnaya kniga, 1988. - Vol. 30, Is. 12. - P.3652-3659. - ISSN 0367-3294
Примечания : Cited References: 14
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Flerov I. N., Melnikova S. V., Kruglik A. I., Misyul S. V., Ageev O. A.
Заглавие : Phase-transitions in layered perovskite like ferroelastics
Коллективы : International meeting on ferroelectricity
Место публикации : International meeting on ferroelectricity (7 ; 1989 ; 28 Aug.-1 Sept. ; Saarbrucken, Fed. Rep. Ger.). Ferroelectrics: GORDON BREACH SCI PUBL LTD, 1990. - Vol. 104, Is. 1. - P.285-297. - ISSN 0015-0193, DOI 10.1080/00150199008223830
Примечания : Cited References: 29
Аннотация: Phase transitions and structural distor-tions in two layered perovskite-like families of crystals are discussed. New data devoted to study of Rb4Cd3Cl10 and RbAlF4 are presented.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : FLEROV I. N., GOREV M. V.
Заглавие : EFFECT OF HYDROSTATIC-PRESSURE ON PHASE-TRANSITIONS IN PEROVSKITE-LIKE RBCL/CDCL2 CRYSTALS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1992. - Vol. 34, Is. 8. - P2555-2558. - ISSN 0367-3294
Примечания : Cited References: 14
Предметные рубрики: RB2CDCL4
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Aleksandrov K. S.
Заглавие : Effect of hydrostatic-pressure on phase-transitions in perovskite-like ferroelastics
Место публикации : Fiz. Tverd. Tela: Mezhdunarodnaya kniga, 1993. - Vol. 35, Is. 6. - P.1657-1666. - ISSN 0367-3294
Примечания : Cited References: 41
Предметные рубрики: SOFT ROTARY MODE
DEPENDENCE
K2RECL6
ANTIFLUORITE
CS2NANDCL6
K2OSCL6
COZRF6
NQR
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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) : Flerov I. N., Gorev M. V., Aleksandrov K. S.
Заглавие : Effect of hydrostatic pressure on phase transitions in perovskite-like ferroelastics
Коллективы : Russian-Japanese symposium on ferroelectricity
Место публикации : Ferroelectrics: Proceedings of the 1994 5th Russian-Japanese Symposium on Ferroelectricity. Part 2 (of 2). - 1995. - Vol. 169, Is. 1. - P.199-205. - ISSN 0015-0193, DOI 10.1080/00150199508217330
Ключевые слова (''Своб.индексиров.''): crystals--hydrostatic pressure--mathematical models--perovskite--phase transitions--pressure effects--thermodynamics--perovskite like ferroelastics--ferroelectric materials
Аннотация: The analysis of hydrostatic pressure influence on ferroelastic phase transitions in three- and two-dimensional perovskite-like crystals is carried out. The nonlinear effects and the change of the dT0/dp sign are discussed on the ground of the thermodynamic theory. Simple model of rigid spheres is used to connect the T0 shift under pressure with the bonds stresses.
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15.

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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16.

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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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Beznosikov B. V.
Заглавие : Architecture of perovskite-like ferroelectrics and HT-supercoductors
Коллективы : International Meeting on Ferroelectricity
Место публикации : J. Korean Phys. Soc. - 1998. - Vol. 32: Suppl. - P.S1790-S1792. - ISSN 0374-4884
Примечания : Cited References: 7
Аннотация: Structures of the known perovskite-like crystals are considered as the systems of slabs containing n layers (n = 1, 2,..., infinity) vertices-linked octahedra BX6, pyramids BX5 or planar square nets BX4 (B - cation, X - anion) intergrowing with blocks of different types. Using these fragments whole variety of stoichiometric, cation-and anion-deficient structures can be constructed and many new perovskite-like layered crystals including ferroelectrics, ferroelastics and HTSC's may be found.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Aleksandrov K. S., Tressaud A., Grannec J., Couzi M.
Заглавие : Phase transitions in elpasolites (ordered perovskites)
Место публикации : Materials Science and Engineering R: Reports. - 1998. - Vol. 24, Is. 3. - P.81-151. - ISSN 0927-796X
Примечания : Cited References: 174
Предметные рубрики: ELASTIC NEUTRON-DIFFRACTION
MII = CO
RAMAN-SCATTERING
THERMODYNAMIC PROPERTIES
CRYSTAL-STRUCTURE
SINGLE-CRYSTALS
RB2KMIIIF6 ELPASOLITES
CUBIC PEROVSKITES
TEMPERATURE FORM
HIGH-RESOLUTION
Ключевые слова (''Своб.индексиров.''): crystal atomic structure--crystal growth--crystal lattices--crystallization--crystallography--ferroelectricity--hydrostatic pressure--order disorder transitions--single crystals--thermodynamics--elpasolites--landau theory--perovskite
Аннотация: Many compounds with general chemical formula A2BB?X6 and with tolerance factor value t < 1 crystallize in the elpasolite (ordered perovskite) structure. Different preparative methods have been considered. For example, the Bridgman technique is the most suitable method of growing single crystals of halogenated elpasolites with monoatomic cations. Group-theory and symmetry analyses have allowed us to build a scheme of possible structural distortions connected with octahedral rotations and displacements of ions. Experimental observations have proven that ferroelastic phase transitions occurring most frequently in elpasolites are due to small octahedra tilts. Quantitative analysis allows the possibility of describing these transitions in the framework of the thermodynamic Landau theory. Hydrostatic pressure and the substitution of atoms in different crystallographic sites allow to change significantly the succession and the temperature of phase transitions. The hypothesis of bond stresses is able to predict the possible occurrence of a phase transition for a particular elpasolite and/or the role of the octahedra rotations in the transformation. The mechanism of phase transitions in elpasolites and related compounds has also been considered. One can assume that a displacive mechanism associated with a strong anharmonicity plays a large role in phase transitions occurring in compounds with monoatomic cations. On the other hand, for instance, in cryolites with ammonium cations, the transitions originate from an order-disorder phenomenon. В© 1998 Elsevier Science S.A. All rights reserved.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Vtyurin A. N., Shmygol' I. V., Goryainov S. V.
Заглавие : Phase transition in the layered perovskite CsScF4 induced by hydrostatic pressure
Место публикации : Phys. Solid State: American Institute of Physics, 1999. - Vol. 41, Is. 9. - P.1541-1543. - ISSN 1063-7834, DOI 10.1134/1.1131019
Примечания : Cited References: 9
Предметные рубрики: SPECTRUM
Аннотация: Using polarization microscopy and Raman scattering, we have discovered a new phase transition in the layered perovskite crystal CsScF4 under a hydrostatic pressure around 6 GPa. The proposed space group of the high-pressure phase is C-2h(2), Z=4. (C) 1999 American Institute of Physics. [S1063-7834(99)03109-3].
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'min E. V., Ovchinnikov S. G., Baklanov I. O.
Заглавие : Superconductivity of strongly correlated electrons in copper and ruthenium oxides within the t-J-I model
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 1999. - Vol. 89, Is. 2. - P349-357. - ISSN 1063-7761, DOI 10.1134/1.558991
Примечания : Cited References: 12
Предметные рубрики: LAYERED PEROVSKITE
SR2RUO4
Аннотация: We propose a t-J-I model with direct ferromagnetic exchange I to explain the superconductivity of copper oxides and the ruthenate Sr2RuO4 on the basis of the analysis of the electronic structure of these substances. We analyze the possible p- and d-type superconducting solutions. Solutions of the s type with singlet pairings are impossible in the strong-electron-correlations regime, and p-type solutions correspond to triplet superconductivity and is formed near the ferromagnetic instability threshold in ruthenates. The solution with the d(x)(2)-y(2) symmetry near the antiferromagnetic instability threshold corresponds to copper oxides. We also discuss the reason for the high values of the superconducting transition temperature (T(c)similar to 100 K) in copper oxides and the low values (T(c)similar to 1 K) in ruthenates. (C) 1999 American Institute of Physics. [S1063- 7761(99)02208-8].
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