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Structural phase-transitions in elpasolites Rb2NaDYF6 and Rb2KDYF6 / B. V. Beznosikov [et al.] // Ferroelectr. Lett. Sect. - 1983. - Vol. 1, Is. 2. - P. 35-41. - Cited References: 12 . - ISSN 0731-5171

РУБ Physics, Condensed Matter

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Доп.точки доступа:
Beznosikov, B. V.; Безносиков, Борис Валерьевич; Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Melnikova, S.V.; Мельникова, Светлана Владимировна; Misyul, S. V.; Мисюль, Сергей Валентинович; Voronov, V. N.; Воронов, Владимир Николаевич
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THERMODYNAMIC PROPERTIES OF ELPASOLITES CS2NANDCL6 AND CS2NAPRCL6 / M. V. GOREV [et al.] // JOURNAL OF PHYSICS C-SOLID STATE PHYSICS. - 1986. - Vol. 19, Is. 14. - P. 2441-2447, DOI 10.1088/0022-3719/19/14/010. - Cited References: 20 . - ISSN 0022-3719

РУБ Physics, Condensed Matter

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Держатели документа:
L v Kirensky Institute of Physics, Academy of Sciences of the USSR, Siberian Branch, 660036 Krasnoyarsk, Russian Federation
Доп.точки доступа:
GOREV, M. V.; Горев, Михаил Васильевич; MISYUL, S. V.; Мисюль, Сергей Валентинович; BOVINA, A. F.; Бовина, Ася Федоровна; ISKORNEV, I. M.; KOKOV, I. T.; FLEROV, I. N.; Флёров, Игорь Николаевич
}
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Structural phase-transitions in Rb2KHOF6 and Rb2KTBF6 elpasolites / V. N. Voronov [и др.] // Fiz. Tverd. Tela. - 1991. - Vol. 33, Is. 10. - P. 2945-2947. - Cited References: 9 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
MODE

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Доп.точки доступа:
Voronov, V. N.; Воронов, Владимир Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Melnikova, S.V.; Мельникова, Светлана Владимировна; Misyul, S. V.; Мисюль, Сергей Валентинович; Flerov, I. N.; Флёров, Игорь Николаевич
}
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Effect of B3+ ion size on the phase transitions in Rb2KB3+F6 elpasolites series / I. N. Flerov [et al.] // Ferroelectrics. - 1991. - Vol. 124, Is. 1. - P. 309-314, DOI 10.1080/00150199108209457 . - ISSN 0015-0193
Аннотация: The physical properties of Rb2KScF6 crystal characterized by the medium size of B3+ atom in Rb2KB3+F6 series are studied. The two successive phase transitions from cubic into tetragonal and then into monoclinic phases are found. The results are discussed in view of the influence of B3+ atom size on structural transformations.

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Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Tressaud, A.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Couzi, M.; Gorev, M. V.; Горев, Михаил Васильевич; Grannec, J.; Melnikova, S. V.; Мельникова, Светлана Владимировна; Chaminade, J. P.; Misul, S. V.; Мисюль, Сергей Валентинович; Voronov, V. N.; Воронов, Владимир Николаевич
}
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    Study of the Fm3m-]14/m-]P21/n successive phase-transitions in Rb2KINF6 and Rb2KLUF6 elpasolites / I. N. Flerov [et al.] // Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 11. - P. 3493-3500. - Cited References: 13 . - ISSN 0367-3294
Рубрики:
THERMODYNAMIC PROPERTIES
   RB2KMIIIF6 ELPASOLITES

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Публикация на русском языке Исследование последовательности фазовых переходов Fm3m→14/m→P2[1]/n в эльпасолитах Rb[2]KInF[6] и Rb[2]KLuF[6] [Текст] / И. Н. Флеров [и др.] // Физ. тверд. тела. - Санкт-Петербург, 1992. - Т. 34 Вып. 11. - С. 3493-3500

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Melnikova, S. V.; Мельникова, Светлана Владимировна; Misyul, S. V.; Мисюль, Сергей Валентинович; Voronov, V. N.; Воронов, Владимир Николаевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Tressaud, A.; Grannec, J.; Shaminade, J. P.; Rabardel, L.; Guingard, H.
}
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    Phase-transitions in elpasolite Rb2KSCF6 / I. N. Flerov [et al.] // Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 7. - P. 2185-2195. - Cited References: 24 . - ISSN 0367-3294
Рубрики:
RB2KMIIIF6 ELPASOLITES
   CS2NANDCL6
   SCATTERING
   RB2NADYF6
   CS2RBDYF6
   RB2KDYF6
   CRYSTAL
   MODE

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Публикация на русском языке Фазовые переходы в эльпасолите Rb[2]KScF[6] [Текст] / И. Н. Флеров [и др.] // Физ. тверд. тела. - 1992. - Т. 34 Вып. 7. - С. 2185-2195

GOREV, M. V.
PHASE-P-T DIAGRAMS OF CS2RBDYF6 AND CS2NATMBR6 ELPASOLITES / M. V. GOREV, I. N. FLEROV // Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 8. - P. 2614-2618. - Cited References: 14 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
THERMODYNAMIC PROPERTIES
   TRANSITIONS
   CS2NANDCL6
   PRESSURE
   MODE

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Доп.точки доступа:
FLEROV, I. N.
}
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P = T-PHASE DIAGRAMS OF ELPASOLITES RB2KB3+F6(B3+ = HO,DY,TB) / M. V. GOREV [и др.] // Fiz. Tverd. Tela. - 1993. - Vol. 35, Is. 4. - P. 1022-1027. - Cited References: 16 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
RIGID SPHERE MODEL
   RB2KMIIIF6 ELPASOLITES
   TRANSITIONS
   ORDER

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Доп.точки доступа:
GOREV, M. V.; FLEROV, I. N.; VORONOV, V. N.; MISYUL, S. V.
}
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THERMOPHYSICAL STUDIES OF THE RB2KFEF6 FERROELASTIC / M. V. GOREV [и др.] // Fiz. Tverd. Tela. - 1994. - Vol. 36, Is. 4. - P. 1121-1125. - Cited References: 15 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
STRUCTURAL PHASE-TRANSITIONS
RB2KMIIIF6 ELPASOLITES
DIAGRAMS

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Доп.точки доступа:
GOREV, M. V.; FLEROV, I. N.; VORONOV, V. N.; TRESSO, A.; GRANNEK, J.; GHAMINADE, J. P.
}
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10.

STUDY OF RB2KSC1-XGAXF6 SOLID-SOLUTIONS / M. V. GOREV [и др.] // Fiz. Tverd. Tela. - 1995. - Vol. 37, Is. 3. - P. 819-823. - Cited References: 12 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
STRUCTURAL PHASE-TRANSITIONS
RB2KMIIIF6 ELPASOLITES
DIAGRAMS

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Доп.точки доступа:
GOREV, M. V.; BOVINA, A. F.; BONDARENKO, G. V.; FLEROV, I. N.; TRESSO, A.; GRANNEK, Z.
}
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11.

Thermodynamic characteristics and phase transitions in Rb3B3+F6 (B3+=Ga, DY) cryolite fluoride crystals / I. N. Flerov [и др.] // Fiz. Tverd. Tela. - 1996. - Vol. 38, Is. 7. - P. 2203-2213. - Cited References: 26 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
HYDROSTATIC-PRESSURE
   ELPASOLITES
   CS2RBDYF6
   RB2KFEF6
   DIAGRAMS

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Доп.точки доступа:
Flerov, I. N.; Gorev, M. V.; Voronov, V. N.; Bovina, A. F.
}
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12.

Flerov, I. N.
Entropy of Rb2KB3+F6 (B3+: Se, In, Lu, Er, Ho) ferroelastics and the triple point on T(R(B)(3+)) diagram / I. N. Flerov, M. V. Gorev, V. N. Voronov // Fiz. Tverd. Tela. - 1996. - Vol. 38, Is. 3. - P. 717-727. - Cited References: 26 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
STRUCTURAL PHASE-TRANSITIONS
RB2KMIIIF6 ELPASOLITES

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Доп.точки доступа:
Gorev, M. V.; Voronov, V. N.
}
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13.

Phase transitions in elpasolites (ordered perovskites) / I. N. Flerov [et al.] // Materials Science and Engineering R: Reports. - 1998. - Vol. 24, Is. 3. - P. 81-151. - Cited References: 174 . - ISSN 0927-796X

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
ELASTIC NEUTRON-DIFFRACTION
   MII = CO
   RAMAN-SCATTERING
   THERMODYNAMIC PROPERTIES
   CRYSTAL-STRUCTURE
   SINGLE-CRYSTALS
   RB2KMIIIF6 ELPASOLITES
   CUBIC PEROVSKITES
   TEMPERATURE FORM
   HIGH-RESOLUTION
Кл.слова (ненормированные):
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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Держатели документа:
L.V. Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation
Inst. Chim. Matiere Cond. B., Universite Bordeaux I, 33608, Pessac Cedex, France
Lab. de Phys.-Chim. Molec., Universite Bordeaux I, 33405, Talence Cedex, France

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Tressaud, A.; Grannec, J.; Couzi, M.
}
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14.

T-x phase diagram of mixed elpasolites Rb2KGaxSc1-xF6 / M. V. Gorev [и др.] // Izv. Akad. Nauk Ser. Fiz. - 1998. - Vol. 62, Is. 8. - P. 1532-1536. - Cited References: 12 . - ISSN 1026-3489

РУБ Physics, Multidisciplinary
Рубрики:
RB2KMIIIF6 ELPASOLITES
   TRANSITIONS
   FERROELASTICS
   RB2KFEF6

WOS

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Bovina, A. F.; Бовина, Ася Федоровна; Chernenko, T. V.; Tressand, A.; Grannes, J.; International Seminar on Physics of Ferroelastics(2 ; 1997 ; Jun 25-27 ; Kazan, Russia)
}
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15.

Flerov, I. N.
Calorimetric investigations of phase transitions in the cryolites (NH4)(3)Ga1-xScxF6 (x = 1.0, 0.1, 0) / I. N. Flerov, M. V. Gorev, T. V. Ushakova // Phys. Solid State. - 1999. - Vol. 41, Is. 3. - P. 468-473, DOI 10.1134/1.1130805. - Cited References: 19 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
FERROELASTICS
   ELPASOLITES
   CRYSTALS
   PRESSURE
Аннотация: The specific heat of the cryolites (NH4)(3)Ga1-xScxF6 with x=1.0, 0.1, and 0 was measured. The thermodynamic parameters of the phase transitions were determined. A previously unknown phase transition was found in the scandium compound at T=243 K. (C) 1999 American Institute of Physics. [S1063-7834(99)03003-8].

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Публикация на русском языке Флеров, Игорь Николаевич. Калориметрические исследования фазовых переходов в криолитах (NH4)3Ga1-xScxF6 (x=1.0, 0.1, 0) [Текст] / И. Н. Флеров, М. В. Горев, Т. В. Ушакова // Физ. тверд. тела. - Санкт-Петербург, 1999. - Т. 41 Вып. 3. - С. 523-528

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Ushakova, T. V.; Флёров, Игорь Николаевич
}
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16.

Zinenko, V. I.
Theory of an Fm3m - I4/m structural phase transition in an Rb2KScF6 crystal / V. I. Zinenko, N. G. Zamkova // J. Exp. Theor. Phys. - 2000. - Vol. 91, Is. 2. - P. 314-323, DOI 10.1134/1.1311990. - Cited References: 16 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
FIRST-PRINCIPLES THEORY
   LATTICE-DYNAMICS
   PEROVSKITES
   ELPASOLITES
Аннотация: An Rb2KScF6 crystal having an elpasolite structure undergoes a sequence of Fm3m -- I4/m -- P12(1)/n1 structural phase transitions where the transition to the tetragonal phase is associated with "rotation" of the ScF6 octahedron. An effective Hamiltonian is constructed to describe the Fm3m -- I4/m transition using the approximation of a local mode for which we selected a "soft mode" whose eigenvector corresponds to the rotation of the octahedron. The effective Hamiltonian also includes the relationship between the local mode and the homogeneous elastic strains. The parameters of the effective Hamiltonian were determined using the generalized Gordon-Kim model of an ionic crystal which allows for the deformability and polarizability of the ions. The thermodynamic properties of a system with this model Hamiltonian were investigated using the Monte Carlo method. The calculated phase transition temperature of 250 K is almost the same as the experimental value (252 K). The tetragonal phase remains stable as far as T = 0 K and a second transition (to the monoclinic phase) cannot be obtained using this effective Hamiltonian. This suggests that if the transition to the tetragonal phase is mainly associated with "rotations" of the octahedrons, in order to describe the phase transition to the monoclinic phase the effective Hamiltonian must allow for additional degrees of freedom mainly associated with the motion of rubidium ions. (C) 2000 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Zamkova, N. G.; Замкова, Наталья Геннадьевна; Зиненко, Виктор Иванович
}
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17.

Phase transitions and pressure-temperature phase diagrams of ammonium containing cryolites and elpasolites / M. V. Gorev [и др.] // Abstracts of the 10-th International Meeting on Ferroelectricity (IMF-10). - 2001. - P. 153

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Tressaud, A.; Zaitsev, A. I.; Зайцев, Александр Иванович; Ushakova, T. V.; Durand, E.; International Meeting on Ferroelectricity (10 ; 2001 ; 3-7 Sept. ; Madrid)
}
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18.

Aleksandrov, K. S.
Structural distortions in families of perovskite-like crystals / K. S. Aleksandrov, J. . Bartolome // Phase Transit. - 2001. - Vol. 74, Is. 3. - P. 255-335, DOI 10.1080/01411590108228754. - Cited References: 262 . - ISSN 0141-1594

РУБ Crystallography + Physics, Condensed Matter
Рубрики:
LOW-TEMPERATURE PHASE
   INELASTIC-NEUTRON-SCATTERING
   POWDER PROFILE REFINEMENT
   MII = CO
   X-RAY
   RAMAN-SCATTERING
   ORDERED PEROVSKITE
   RHOMBOHEDRAL PEROVSKITES
   RB2KMIIIF6 ELPASOLITES
   MAGNETIC-PROPERTIES
Кл.слова (ненормированные):
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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Держатели документа:
LV Kirenskii Inst Phys, Siberian Branch, Russian Acad Sci, Krasnoyarsk 660036, Russia
Univ Zaragoza, CSIC, Inst Ciencias Mat Aragon, Zaragoza, Spain
ИФ СО РАН

Доп.точки доступа:
Bartolome, J.; Александров, Кирилл Сергеевич
}
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19.

Zinenko, V. I.
Lattice dynamics and statistical mechanics of the Fm3m - I4/m structural phase transition in Rb2KInF6 / V. I. Zinenko, N. G. Zamkova // Phys. Solid State. - 2001. - Vol. 43, Is. 12. - P. 2290-2300, DOI 10.1134/1.1427959. - Cited References: 18 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
FIRST-PRINCIPLES THEORY
   RB2KSCF6 CRYSTAL
   ELPASOLITES
   PEROVSKITES
Аннотация: The static and dynamic properties of cubic Rb2KInF6 crystals with elpasolite structure are calculated using a nonempirical method. Calculations are performed within a microscopic ionic-crystal model taking into account the deformation and polarization of ions. The deformation parameters of ions are determined by minimizing the total energy of the crystal. The calculated equilibrium lattice parameters agree satisfactorily with the experimental data. It is found that in the cubic phase there are vibrational modes that are unstable everywhere in the Brillouin zone. The eigenvectors of the unstablest mode at the center of the Brillouin zone of the cubic phase are associated with the displacements of F ions and correspond to rotations of InF6 octahedra. Condensation of this mode leads to a tetragonal distortion of the structure. In order to describe the Fm3m -- I4/m phase transition, an effective Hamiltonian is constructed under the assumption that the soft mode whose eigenvector corresponds to octahedron rotation is local and coupled with homogeneous elastic strains. The parameters of the effective Hamiltonian are determined using the calculated crystal energy for the distorted structures due to soft-mode condensation. The thermodynamic properties of the system with this model Hamiltonian are investigated using the Monte Carlo method. The phase transition temperature is calculated to be 550 K, which is twice its experimental value (283 K). The tetragonal phase remains stable down to T = 0 K; the effective Hamiltonian used in this paper thus fails to describe the second phase transition (to the monoclinic phase). Thus, the transition to the tetragonal phase occurs for the most part through octahedron rotations; however, additional degrees of freedom, first of all, the displacements of Rb ions, should be included into the effective Hamiltonian in order to describe the transition to the monoclinic phase. (C) 2001 MAIK "Nauka/ Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Zamkova, N. G.; Замкова, Наталья Геннадьевна; Зиненко, Виктор Иванович
}
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20.

Flerov, I. N.
Entropy and the mechanism of phase transitions in elpasolites / I. N. Flerov, M. V. Gorev // Phys. Solid State. - 2001. - Vol. 43, Is. 1. - P. 127-136, DOI 10.1134/1.1340198. - Cited References: 33 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
ORDERED PEROVSKITE PB2MGTEO6
   ELASTIC NEUTRON-DIFFRACTION
   THERMODYNAMIC PROPERTIES
   CUBIC PEROVSKITES
   CRYSTAL-STRUCTURE
   HIGH-RESOLUTION
   PB2MGWO6
   CSPBCL3
Аннотация: The phase transitions in series of crystals with the general formulas A(2)BB'X-6 (X = F, Cl, Br, or CN) and Pb2BB'O-6 that belong to the elpasolite family (space group Fm(3) over bar m) are analyzed. The influence of the size and the shape of cations and anions on the entropy and the mechanism of structural distortions is discussed. (C) 2001 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Inst. of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Флёров, Игорь Николаевич
}
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