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    Фокина, Валентина Дмитриевна.
    Калориметрические исследования фазовых переходов во фторидах и оксифторидах со структурой эльпасолита [Рукопись] : дис. на соиск. уч. степени канд. физ.-мат. наук : 01.04.07 / В. Д. Фокина ; науч. рук. И. Н. Флёров ; Рос. акад. наук, Сиб. отд-ние, Ин-т физики им. Л.В. Киренского. - Красноярск, 2005. - 130 с. - Библиогр.: с. 123-130 (74 назв.). -

ГРНТИ

29.19.15

ББК В375я031

Держатели документа:
Библиотека Института физики им. Л. В. Киренского СО РАН
Доп.точки доступа:
Флёров, Игорь Николаевич \науч. рук.\; Flerov, I. N.; Fokina, V. D.; Российская академия наук; Сибирское отделение РАН; Институт физики им. Л.В. Киренского Сибирского отделения РАН
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Thermal properties and phase transitions in (NH4) 3ZrF7 / V. D. Fokina [et al.] // Journal of Fluorine Chemistry. - 2013. - Vol. 154. - P. 1-6, DOI 10.1016/j.jfluchem.2013.07.001 . - ISSN 0022-1139
Кл.слова (ненормированные):
Cubic fluorides -- Entropy -- Permittivity -- Phase transitions -- Pressure effect -- Thermal dilatation
Аннотация: The heat capacity, thermal dilatation, permittivity, and T-p phase diagram of (NH4)3ZrF7 have been studied in wide temperature and pressure ranges. Two phase transitions were found in addition to previously known structural transformations. The stability of crystal phases to temperature and pressure has been examined and a possibility of transition between two cubic phases has been discussed. The total excess entropy change SDSi = Rln6 is characteristic for the order-disorder processes, but its stepwise increase is not consistent with the structural model associated with the strong disorder assumed in the initial cubic phase. В© 2013 Elsevier B.V. All rights reserved.

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Держатели документа:
RAS, Siberian Dept, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Agr Univ, Krasnoyarsk 660049, Russia
RAS, Far Eastern Dept, Inst Chem, Vladivostok 690022, Russia

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
}
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Heat capacity and structure of Rb2KMeO3F3 (Me: Mo, W) elpasolites / A. V. Kartashev [et al.] // Solid State Sci. - 2012. - Vol. 14, Is. 1. - P. 166-170, DOI 10.1016/j.solidstatesciences.2011.11.019. - Cited References: 12. - This study was supported by the Siberian Branch of the Russian Academy of Sciences (Grant no. 34) and the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (NSh-4645.2010.2). . - ISSN 1293-2558

РУБ Chemistry + Physics
Рубрики:
T PHASE-DIAGRAM
Rb2KMoO3F3
TRANSITION
Кл.слова (ненормированные):
Oxyfluorides -- Crystal structure -- Phase transition -- Calorimetry
Аннотация: X-ray and heat capacity measurements were performed on Rb2KMoO3F3 and Rb2KWO3F3 single crystals. A significant difference in the thermal parameters of atoms in 4a and 8c sites of Fm-3m structure was found, which depended on the central atom. Calorimetric measurements have revealed the heat capacity anomalies at 195 and 67 K, respectively, in Rb2KMoO3F3 and Rb2KWO3F3. The standard molar enthalpy and entropy were determined. Entropy changes associated with phase transitions in oxyfluorides under study and related Rb2KTiOF5 are discussed. 2011 Elsevier Masson SAS. All rights reserved.

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Держатели документа:
[Gorev, Michail V.] Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Kartashev, Andrey V.
Gorev, Michail V.
Flerov, Igor N.] Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660074, Russia
[Isaenko, Lyudmila I.
Zhurkov, Sergey A.] Russian Acad Sci, Inst Geol & Mineral, Novosibirsk 630090, Russia

Доп.точки доступа:
Kartashev, A. V.; Карташев, Андрей Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Isaenko, L. I.; Zhurkov, S. A.; Fokina, V. D.; Фокина, Валентина Дмитриевна; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Siberian Branch of the Russian Academy of Sciences [34]; Russian Federation for the Support of Leading Scientific Schools of the Russian Federation [NSh-4645.2010.2]
}
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Сегнетоэластические фазовые переходы во фторидах со структурой криолита и эльпасолита / И. Н. Флеров [и др.] // Кристаллография. - 2004. - Т. 49, Вып. 1. - С. 107-114. - Библиогр.: 40 назв. . - ISSN 0023-4761
Аннотация: Выполнен анализ сегнетоэластических фазовых переходов в нескольких рядах фтористых кристаллов с общей формулой A[2]BB{'}F[6], принадлежащих к семействам эльпасолита и криолита (пр. гр. Fm3m). Обсуждается характер влияния размера и формы катионов и анионов на энтропию и механизм структурных искажений

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Другая переводная версия Ferroelastic phase transitions in fluorides with cryolite and elpasolite structures [Текст] / I. N. Flerov, M. V. Gorev, K. S. Aleksandrov [et al.] // Kristallogr. - 2004. - Vol. 49 Is. 1.- P.107-115

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

Доп.точки доступа:
Флёров, Игорь Николаевич; Flerov, I. N.; Горев, Михаил Васильевич; Gorev, M. V.; Александров, Кирилл Сергеевич; Aleksandrov, K. S.; Трессо, А.; Фокина, Валентина Дмитриевна; Fokina, V. D.
}
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Структурные изменения при фазовых переходах в оксифториде K[3]WO[3]F[3] / М. С. Молокеев [и др.] // Физ. тверд. тела. - 2011. - Т. 53, Вып. 4. - С. 778-783. - Библиогр.: 19 назв. - Работа выполнена при финансовой поддержке Российского фонда фундаментальных исследований (грант N 09-02-00062) и в рамках Междисциплинарного проекта N 34 СО РАН . - ISSN 0367-3294
Аннотация: По данным рентгеновского эксперимента от порошкового образца определены структуры трех фаз кристалла K[3]WO[3]F[3]. Уточнение профильных и структурных параметров проводилось по методике, реализованной в программе DDM. Обсуждение полученных результатов ведется с привлечением теоретико-группового анализа полного конденсата параметров порядка, учитывающего критические и некритич. смещения атомов и позволяющего интерпретировать полученные эксперим. данные. Установлена следующая последовательность структурных изменений: FM3m'-'{11-10(Г[4]{-})}[('эта'[1],0.0)]I4mm'-'{11-10(Г[4]{-})}[('эта'[1],'эта'[2],0)]Cm

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Держатели документа:
Институт физики Сибирского отделения РАН

Доп.точки доступа:
Молокеев, Максим Сергеевич; Molokeev, M. S.; Мисюль, Сергей Валентинович; Фокина, Валентина Дмитриевна; Fokina, V. D.; Кочарова, Алла Георгиевна; Kocharova A.G.; Александров, Кирилл Сергеевич; Aleksandrov, K. S.
}
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    Ferroelastic phase transitions in fluorides with cryolite and elpasolite structures / I. N. Flerov [et al.] // Crystallogr. Rep. - 2004. - Vol. 49, Is. 1. - P. 100-107, DOI 10.1134/1.1643969. - Cited References: 43 . - ISSN 1063-7745
Рубрики:
NUCLEAR MAGNETIC-RESONANCE
   THERMODYNAMIC PROPERTIES
   RB2KMIIIF6 ELPASOLITES
   NEUTRON-DIFFRACTION
   CRYSTALS
   PEROVSKITES
   DIAGRAM
   SC
   RB2KGAXSC1-XF6
   SCATTERING
Аннотация: The ferroelastic phase transitions are investigated in several series of fluoride crystals belonging to the elpasolite and cryolite families (space group Fm (3) over barm) with the general formula A(2)BB'F-6. The influence of the size and shape of cations and anions on the entropy and the mechanism of structural distortions is discussed. (C) 2004 MAIK "Nauka/Interperiodica".

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Публикация на русском языке Сегнетоэластические фазовые переходы во фторидах со структурой криолита и эльпасолита [Текст] / И. Н. Флеров [и др.] // Кристаллография. - 2004. - Т. 49 Вып. 1. - С. 107-114

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Inst Chim Mat Condensee Bordeaux, F-33608 Pessac, France
ИФ СО РАН

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Tressaud, A.; Fokina, V. D.; Фокина, Валентина Дмитриевна
}
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Structure transformations during phase transitions in the K 3WO 3F 3 oxyfluoride / M. S. Molokeev [et al.] // Physics of the Solid State. - 2011. - Vol. 53, Is. 4. - P. 834-839, DOI 10.1134/S1063783411040251 . - ISSN 1063-7834
Аннотация: The structures of three phases of the K 3WO 3F 3 crystal have been determined from X-ray diffraction data obtained for a powder sample. The profile and structural parameters have been refined according to the technique implemented in the DDM program. The results obtained have been discussed using the group-theoretical analysis of the complete order parameter condensate, which takes into account the critical and noncritical atomic displacements and allows the interpretation of the experimental data. The sequence of structural transformations is found to be as follows. В© 2011 Pleiades Publishing, Ltd.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Misyul', S. V.; Мисюль, Сергей Валентинович; Fokina, V. D.; Фокина, Валентина Дмитриевна; Kocharova, A. G.; Кочарова, Алла Георгиевна; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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Ferroelastic phase transitions in fluorides with cryolite and elpasolite structures / I. N. Flerov, M. V. Gorev, K. S. Aleksandrov [et al.] // Kristallogr. - 2004. - Vol. 49, Is. 1. - P. 107-115 . - ISSN 0023-4761

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Другая переводная версия

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Tressaud, A.; Fokina, V. D.; Фокина, Валентина Дмитриевна
}
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Specific heat, cell parameters, phase T-p diagram, and permittivity of cryolite (NH4)(3)Nb(O-2)(2)F-4 / V. D. Fokina [et al.] // Phys. Solid State. - 2011. - Vol. 53, Is. 10. - P. 2147-2153, DOI 10.1134/S1063783411100131. - Cited References: 19. - This study was performed within the Interdisciplinary integration project of the Siberian Branch of the Russian Academy of Science no. 34 and supported by the grant of the President of the Russian Federation for Leading Scientific Schools of the Russian Federation (NSh-4645.2010.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CRYSTAL-STRUCTURES
   TRANSITIONS
   (NH4)(3)TIOF5
   OXYFLUORIDE
   COMPLEXES
   CAPACITY
   DISORDER
Аннотация: The temperature dependences of the specific heat, unit cell parameters, susceptibility to hydrostatic pressure, and permittivity of cryolite (NH4)(3)Nb(O-2)(2)F-4 have been studied. Phase transitions of nonferroelectric nature have been detected. Entropy parameters point to the relation of structure distortions to ordering processes.

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Держатели документа:
[Fokina, V. D.
Bovina, A. F.
Bogdanov, E. V.
Pogorel'tsev, E. I.
Gorev, M. V.
Flerov, I. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far Branch E, Vladivostok 690022, Russia
[Gorev, M. V.
Flerov, I. N.] Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Science, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Institute of Chemistry, Far-East Branch of the Russian Academy of Sciences, pr. 100 Let Vladivostoku 159, Vladivostok 690022, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Bovina, A. F.; Бовина, Ася Федоровна; Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogorel'tsev, E. I.; Laptash, N. M.; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич
}
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10.

Phase transitions in the (NH4)(2)NbOF5 oxyfluoride / V. D. Fokina [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 4. - P. 781-788, DOI 10.1134/S1063783410040189. - Cited References: 13. - We would like to thank A. A. Udovenko (Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia) for kindly supplied detailed data on the atomic coordinates in the structure of the (NHINF4/INF)INF2/INFNbOFINF5/INF oxyfluoride.This study was supported by the Russian Foundation for Basic Research (project no. 09-02-00062) and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-1011.2008.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CRYSTAL-STRUCTURE
   (NH4)(2)WO2F4
   MECHANISM
   DISORDER
Аннотация: The thermal and dielectric properties of the (NH4)(2)NbOF5 oxyfluoride have been investigated. It has been established that the structural phase transitions Cmc2(1) - C2 - Ia observed at the temperatures T (1) = 258.0 K and T (2) = 218.9 K exhibit a nonferroelectric nature. The hydrostatic pressure, which stabilizes the initial phase and destabilizes the low-temperature phase, hardly affects the temperature range of stability of the intermediate phase. The model of sequential ordering of the structural elements due to phase transitions has been analyzed using experimental data on the entropies of the phase transitions.

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Держатели документа:
[Fokina, V. D.
Bogdanov, E. V.
Gorev, M. V.
Molokeev, M. S.
Flerov, I. N.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Fokina, V. D.
Gorev, M. V.
Pogorel'tsev, E. I.
Flerov, I. N.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Laptash, N. M.] Russian Acad Sci, Far Eastern Branch, Inst Chem, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, pr. Svobodny 79, Krasnoyarsk 660041, Russian Federation
Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Bogdanov, E. V.; Богданов, Евгений Витальевич; Gorev, M. V.; Горев, Михаил Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Pogorel'tsev, E. I.; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
}
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11.

Calorimetric and dielectric studies of the (NH4)(2)MoO2F4 oxyfluoride / V. D. Fokina [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 1. - P. 158-166, DOI 10.1134/S1063783410010282. - Cited References: 22. - This study was supported by the Russian Foundation for Basic Research ( project no. 09-02-00062). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
   (NH4)(2)WO2F4
   DIFFRACTION
   MECHANISM
   CRYSTALS
Аннотация: The temperature dependences of the heat capacity, dielectric properties, and response to an external pressure and an electric field for the (NH4)(2)MoO2F4 oxyfluoride (space group Cmcm, Z = 4) have been studied. A comparative analysis of the data on the entropy of phase transitions, p-T phase diagrams, permittivity, and anomalous heat capacity in combination with the results of previous studies of the related compounds (NH4)(2)WO2F4 and (ND4)(2)WO2F4 has made it possible to establish that both [MO2F4](2-) anions and ammonium groups play a substantial role in the mechanism and nature of the structural transformations.

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Держатели документа:
[Fokina, V. D.
Bogdanov, E. V.
Bondarev, V. S.
Flerov, I. N.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Fokina, V. D.
Pogorel'tsev, E. I.
Bondarev, V. S.
Flerov, I. N.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Laptash, N. M.] Russian Acad Sci, Far Eastern Branch, Inst Chem, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, pr. Svobody 79, Krasnoyarsk 660041, Russian Federation
Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogorel'tsev, E. I.; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
}
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12.

Heat capacity, p-T phase diagram, and structure of Rb2KTiOF5 / V. . Fokina [et al.] // Phys. Solid State. - 2008. - Vol. 50, Is. 11. - P. 2175-2183, DOI 10.1134/S1063783408110280. - Cited References: 23. - This work was supported by the Russian Foundation for Basic Research, project no. 06-02-16102. . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
ELECTRON-DIFFRACTION
   TRANSITIONS
   OXYFLUORIDES
   (NH4)(2)KWO3F3
   TEMPERATURE
   XRD
   CS
Кл.слова (ненормированные):
61 -- 50 -- Ks -- 65 -- 40 -- Ba -- 65 -- 40 -- gd -- 78 -- 30 -- Hv -- 81 -- 30 -- Dz
Аннотация: Elpasolite Rb2KTiOF5 (space group, Fm was synthesized using a solid-phase reaction method. The temperature dependences of the heat capacity, the unit cell parameters, the structure, the permittivity, the response to an external pressure, and the Raman spectra were studied. A nonferroelectric phase transition was revealed at T (0) = 215 K; the transition is accompanied by a tetragonal distortion of the unit cell (space group I4/m, Z = 10) and a change in the entropy (S (0) = Rln8), which is anomalously large for perovskite-like oxyfluorides with atomic cations. The specific features of the mechanism of structure distortion are discussed in combination with the previous experimental data obtained for cryolite (NH4)(3)TiOF5 and elpasolite Rb2KGaF6.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, pr. Svobodnyi 59, Krasnoyarsk, 660074, Russian Federation
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Flerov, I. N.; Флёров, Игорь Николаевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Krylov, A. S.; Крылов, Александр Сергеевич; Bovina, A. F.; Бовина, Ася Федоровна; Voronov, V. N.; Воронов, Владимир Николаевич; Laptash, N. M.
}
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13.

Mechanism and nature of phase transitions in the (NH4)(3)MoO3F3 oxyfluoride / I. N. Flerov [et al.] // Phys. Solid State. - 2008. - Vol. 50, Is. 3. - P. 515-524, DOI 10.1134/S1063783408030219. - Cited References: 13 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
(NH4)(2)WO2F4
DIFFRACTION
CS
Аннотация: The temperature dependences of the heat capacity, the unit cell parameter, and the permittivity for the (NH4)(3)MoO3F3 cryolite (space group Fm (3) over barm) are investigated. It is revealed that the compound undergoes ferroelectric and ferroelastic structural phase transitions at temperatures of 297 and 205 K, respectively. The mechanism of structural distortions is discussed in terms of the entropy parameters, pressure-temperature phase diagrams, and electron density maps for critical atoms. An analysis is made of the influence of the cation size and shape on the phase transitions in oxyfluorides of the general formula A(2)A'MO3F3 (A,A' = NH4, K; M = Mo, W).

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Держатели документа:
[Flerov, I. N.
Fokina, V. D.
Bovina, A. F.
Bogdanov, E. V.
Molokeev, M. S.
Kocharova, A. G.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Pogorel'tsev, E. I.] Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660074, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Bovina, A. F.; Бовина, Ася Федоровна; Bogdanov, E. V.; Богданов, Евгений Витальевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Kocharova, A. G.; Кочарова, Алла Георгиевна; Pogorel'tsev, E. I.; Laptash, N. M.
}
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14.

Thermophysical studies of the phase transitions in (NH4)(3)NbOF6 crystals / V. D. Fokina [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 8. - P. 1548-1553, DOI 10.1134/S1063783407080240. - This work was supported by the Russian Foundation for Basic Research (project no. 06-02-16102), Krasnoyarsk Regional Science Foundation (project no.16G098), and the Council on Grants from President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (project NSh-4137.2006.2). - Cited References: 17 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
OXYFLUORIDES
   DISORDER
   RB
   CS
Аннотация: The thermophysical properties of oxyfluoride (NH4)(3)NbOF6 were studied in detail over wide ranges of temperatures and pressures. At atmospheric pressure, a sequence of four structural phase transitions was established with the following changes in entropy: Delta S (1) = Rln 2.7, delta S (2) = Rln38.3, Delta S (3) = 0.08R, and Delta S (4) = 0.17R. An external hydrostatic pressure was found to narrow the region of existence of the initial cubic phase. A triple point was detected in the p-T diagram; at a pressure above 0.07 GPa, the transition between the tetragonal and monoclinic phases occurs through a distorted high-pressure phase.

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Публикация на русском языке Теплофизические исследования фазовых переходов в кристалле (NH4)3NBOF6 [Текст] / Н. Б. Иванова [и др.] // Физ. тверд. тела. - 2007. - Т. 49 Вып. 8. - С. 1475-1479

Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Far E Div, Inst Chem, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Bovina, A. F.; Бовина, Ася Федоровна; Laptash, N. M.
}
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15.

Effect of deuteration on the thermal properties and structural parameters of the (NH4)(2)WO2F4 oxyfluoride / I. N. Flerov [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 6. - P. 1149-1156, DOI 10.1134/S1063783407060212. - Cited References: 11 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PEROVSKITE-LIKE OXYFLUORIDES
   PHASE-TRANSITIONS
   (NH4)(3)WO3F3
   (NH4)(3)TIOF5
Аннотация: The thermal properties and structure of (ND4)(2)WO2F4 crystals are investigated. It is established that deuteration does not lead to a change in the symmetry of the initial phase Cmcm but considerably decreases the extent of its disordering, which, in turn, brings about a substantial decrease in the phase transition entropy. Apart from the anomalies associated with phase transitions characteristic of the protonic compound, the heat capacity exhibits two additional anomalies. Analysis of the phase diagram of the deuterated crystal reveals a triple point at a pressure p = 0.18 GPa, which is predicted for (NH4)(2)WO2F4 at about 0.7 GPa.

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

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bovina, A. F.; Бовина, Ася Федоровна; Kocharova, A. G.; Кочарова, Алла Георгиевна
}
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16.

Heat capacity, structure, and p-T phase diagram of elpasolite (NH4)(2)KMoO3F3 / I. N. Flerov [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 1. - P. 141-147, DOI 10.1134/S1063783407010234. - Cited References: 8 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
TRANSITIONS
Аннотация: Thermophysical and structural studies of an (NH4)(2)KMoO3F3 crystal show that this crystal belongs to the family of elpasolites (space group Fm (3) over barm) and undergoes an order-disorder phase transition at To 241.5 K. Under hydrostatic pressure, this phase transition splits into two consecutive transitions at the tricritical point with parameters T-tr = 232.5 K and p(tr)= 0.21 GPa. It was found that anomalous hysteresis and relaxation phenomena accompany the transitions from the cubic to both distorted phases. The results are analyzed taking into account the data on the phase transition in the related elpasolite (NH4)(2)KWO3F3.

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Russian Acad Sci, Far Eastern Div, Inst Chem, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Institute of Chemistry, Far Eastern Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Bovina, A. F.; Бовина, Ася Федоровна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Pogorel'tsev, E. I.; Laptash, N. M.
}
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17.

Raman scattering study of ordering processes and phase transitions in A(2)BWO(3)F(3) oxyfluorides crystals / A. N. Vtyurin [et al.] ; ed. B Perrin [et al.] // 12TH INTERNATIONAL CONFERENCE ON PHONON SCATTERING IN CONDENSED MATTER (PHONONS 2007). Ser. Journal of Physics Conference Series : IOP PUBLISHING LTD, 2007. - Vol. 92: 12th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004) (JUL 15-20, 2007, Paris, FRANCE). - Ст. 12158, DOI 10.1088/1742-6596/92/1/012158. - Cited References: 6 . - ISBN 1742-6588

РУБ Physics, Condensed Matter
Рубрики:
(NH4)(3)WO3F3
Аннотация: Raman spectra of perovskite-like (NH(4))(3)WO(3)F(3), (NH(4))(2)KWO(3)F(3) and Cs(2)(NH(4))WO(3)F(3) oxyfluorides are obtained in a wide temperature range including transition points. Transition anomalies are found and analyzed. Transformation in (NH(4))(3)WO(3)F(3) is shown to be bound with octahedron groups ordering and strong distortion of ammonium ions due to H-bond formation, that is accompanied by cell volume multiplication, hardening and formation of complex discrete low frequency lattice spectrum. Same cell doubling was found in (NH(4))(2)KWO(3)F(3), but without lattice ordering Cs(2)(NH(4))WO(3)F(3) lattice stays disordered down to 15 K.

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Держатели документа:
[Vtyurin, A. N.
Krylov, A. S.
Gerasimova, J. V.
Fokina, V. D.
Kocharova, A. G.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Institute of Chemistry, 690022 Vladivostok, Russian Federation
Institute of Automation and Electrometry, 630090 Novosibirsk, Russian Federation

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Gerasimova, J. V.; Герасимова, Юлия Валентиновна; Fokina, V. D.; Фокина, Валентина Дмитриевна; Kocharova, A. G.; Кочарова, Алла Георгиевна; Laptash, N. M.; Voyt, E. I.; Surovtsev, N. V.; Perrin, B. \ed.\; Bonello, B. \ed.\; Devos, A. \ed.\; Duquesne, JY. \ed.\; Duquesne,, Y. \ed.\
}
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18.

Calorimetric and x-ray diffraction studies of the (NH4)(3)WO3F3 and (NH4)(3)TiOF5 perovskite-like oxyfluorides / I. N. Flerov [et al.] // Phys. Solid State. - 2004. - Vol. 46, Is. 5. - P. 915-921, DOI 10.1134/1.1744971. - Cited References: 11 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
ELPASOLITE
K3MOO3F3
Аннотация: The heat capacity and unit cell parameters of the (NH4)(3)WO3F3 and (NH4)(3)TiOF5 perovskite-like oxyfluorides were measured in the temperature interval from 80 to 300 K; the existence of two and one phase transitions in these compounds, respectively, was demonstrated, and their thermodynamic parameters were determined. The effect of a hydrostatic pressure of up to 0.5 GPa on the phase transition temperatures was studied. Triple points and high-pressure phases were found in the T vs. p diagrams. An analysis of entropy changes suggests that all the structural transformations revealed are associated with the ordering of structural blocks. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Bovina, A. F.; Бовина, Ася Федоровна; Laptash, N. M.
}
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19.

A study of the phase diagrams of (NH4)(3)Ga1-xScxF6 ammonium cryolites / M. V. Gorev [et al.] // Phys. Solid State. - 2002. - Vol. 44, Is. 10. - P. 1954-1960, DOI 10.1134/1.1514787. - Cited References: 15 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
TRANSITIONS
Аннотация: This paper reports on the results of analyzing p-T and x-T phase diagrams and calorimetric properties of solid solutions in (NH4)(3)Ga1 - xScxF6 cryolites with scandium concentrations x = 0.0, 0.1, 0.35, 0.4, 0.6, 0.8, and 1.0. The thermodynamic parameters of the phase transitions observed in the studied compounds are determined. The generalized phase diagram and successive structural transformations in a series of (NH4)(3)Me3+F6 ammonium cryolites are discussed. (C) 2002 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Inst Chim Mat Condensee Bordeaux, F-33608 Pessac, France
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Tressaud, A.; Denu, D.; Zaitsev, A. I.; Зайцев, Александр Иванович; Fokina, V. D.; Фокина, Валентина Дмитриевна
}
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20.

Heat capacity, structural disorder, and the phase transition in cryolite (NH4)(3)Ti(O-2)F-5 / I. N. Flerov [et al.] // Phys. Solid State. - 2006. - Vol. 48, Is. 8. - P. 1559-1567, DOI 10.1134/S1063783406080221. - Cited References: 18 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PEROVSKITE-LIKE OXYFLUORIDES
   CRYSTAL-STRUCTURES
   (NH4)(3)TIOF5
   (NH4)(3)WO3F3
   DIFFRACTION
Аннотация: The heat capacity, T-p phase diagrams, and unit cell parameters of cryolite (NH4)(3)Ti(O-2)F-5 were studied over a wide temperature range. A phase transition was found near 226 K, and its thermodynamic characteristics and their dependence on the crystallization conditions were determined. The coordinates and thermal parameters of atoms in the Fm3m phase were refined. An analysis of the electron density distribution and the transition entropy showed that the mechanism of the structural transition involves, above all, rotation of the Ti(O-2)F-5 octahedra. Possible models of disordering of tetrahedral ammonium groups are considered.

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Bovina, A. F.; Бовина, Ася Федоровна; Laptash, N. M.
}
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