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Structural phase transition in elpasolite-like (NH4)(2)KWO3F3 / I. N. Flerov [et al.] // Phys. Solid State. - 2006. - Vol. 48, Is. 1. - P. 106-112, DOI 10.1134/S1063783406010215. - Cited References: 16 . - ISSN 1063-7834

РУБ Physics, Condensed Matter

Аннотация: A new chemical compound, (NH4) 2KWO3 F-3, was synthesized. The Rietveld-refined crystal structure was found to be cubic at room temperature and to belong to the elpasolite family (space group). The heat capacity and unit cell parameters were studied within a broad temperature range. A second-order phase transition was found to occur at 235.4 K and to be well described in terms of phenomenological theory. Hydro-static pressure broadens the temperature interval of stability of the cubic phase (dT(0)/dp = -10.8K GPa(-1)). A possible model of structural ordering based on a comparison of the entropy parameters and electron density distribution in oxygen and fluorine atoms is discussed.

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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:
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; Boiko, Y. V.; Voronov, V. N.; Воронов, Владимир Николаевич; Kocharova, A. G.; Кочарова, Алла Георгиевна
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A study of phase transition in (NH4)(3)WO3F3 oxyfluoride by Raman scattering / A. S. Krylov [et al.] // Phys. Status Solidi B. - 2006. - Vol. 243, Is. 2. - P. 435-441, DOI 10.1002/pssb.200541259. - Cited References: 11 . - ISSN 0370-1972

РУБ Physics, Condensed Matter
Рубрики:
ELPASOLITE RB2KSCF6
Аннотация: Raman scattering spectra of perovskite-like (NH4)(3)WO3F3 oxyfluoride are studied in the 70-3600 cm(-1) frequency range and the 93-323 K temperature range including the transition point from orientationally disordered cubic phase into the lower symmetry one. Internal vibrations of ammonium ions and WO3F3 octahedra have been found to exhibit transition anomalies. Analysis of measurements suggests that the transition under study is due mainly to the ordering of octahedra.

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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Inst Chem, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Institute of Chemistry, 690022 Vladivostok, Russian Federation

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Gerasimova, J. V.; Герасимова, Юлия Валентиновна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Laptash, N. M.; Voyt, E. I.
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Zinenko, V. I.
Lattice dynamics of K2NaAlF6, K3AlF6, and Na3AlF6 crystals with the elpasolite structure / V. I. Zinenko, N. G. Zamkova, S. N. Sofronova // J. Exp. Theor. Phys. - 1998. - Vol. 87, Is. 5. - P. 944-951, DOI 10.1134/1.558743. - Cited References: 10 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary

Аннотация: This paper presents the results of a nonempirical calculation of the static and dynamic properties of K2NaAlF6, K3AlF6, and Na3AlF6 crystals with the elpasolite structure. The calculation is based on a microscopic model of an ionic crystal that allows for the deformability and polarizability of the ions. The deformability parameters of the ions are determined by minimizing the total energy of the crystal. The total energy is regarded as a functional of the electron density, using the local Thomas-Fermi approximation and taking into account exchange (correlation) effects. The results of the calculations of the equilibrium lattice parameters and of the permittivities are in good agreement with the experimental data. Unstable vibrational modes are found in the spectrum of the lattice vibrations, with these modes occupying the phase space in the entire Brillouin zone. (C) 1998 American Institute of Physics. [S1063-7761(98)01311-0].

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Sect, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН

Доп.точки доступа:
Zamkova, N. G.; Замкова, Наталья Геннадьевна; Sofronova, S. N.; Софронова, Светлана Николаевна; Зиненко, Виктор Иванович
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Raman scattering and phase transitions in fluorides with elpasolite structure / A. Vtyurin [et al.] // Ferroelectrics : Proceedings of the Joint International Symposium. - 2017. - Vol. 512, Is. 1. - P. 58-64, DOI 10.1080/00150193.2017.1349863. - Cited References: 22 . - ISSN 0015-0193
Кл.слова (ненормированные):
Ferroelectric materials -- Ferroelectricity -- Elpasolite -- First-order phase transitions -- Fluorescence process -- Raman lines -- Raman scattering spectra -- Temperature phase -- Temperature range -- Raman scattering
Аннотация: Raman scattering spectra of Rb2KHoF6 and Rb2KDyF6 crystals have been studied in temperature range from 20 K to 399 K and from 7 K to 500 K respectively. Raman spectra of Rb2KHoF6 crystal are distorted due to the fluorescence process. Parameters of Raman lines have been quantitatively analyzed. The investigation points to the considerable role of CX6 groups in the temperature phase transition in Rb2KHoF6 and Rb2KDyF6 crystals. The anomalies of spectra changes with temperature testify the first order phase transitions in these crystals. © 2017 Taylor & Francis Group, LLC.

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Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Krylova, S. N.; Крылова, Светлана Николаевна; Joint Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(13 ; 2016 ; June 19-24 ; Matsue, Japan); International Workshop on Relaxor Ferroelectrics(8 ; June 19-24, 2016 ; Matsue, Japan)
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    Raman scattering and phase transitions in fluorides with elpasolite structure / A. N. Vtyurin [et al.] // Joint 13th Russia/CIS/Baltic/Japan Symp. on Ferroelectricity and Int. Workshop on Relaxor Ferroelectrics (RCBJSF-IWRF 2016) : book of abstracts. - 2016. - Ст. Oral-29. - References: 8
   Перевод заглавия: Комбинационное рассеяние света и фазовые переходы в фторидах со структурой эльпасолита

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Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Goryainov, S. V.; Горяйнов, Сергей Владимирович; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(13 ; 2016 ; Jun. ; 19-23 ; Matsue, Japan); International Workshop on Relaxor Ferroelectrics(2016 ; Jun. ; 19-23 ; Matsue, Japan)
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Raman spectra and lattice dynamics simulation of the elpasolite crystals at high pressure: comparative analysis / A. S. Oreshonkov [et al.] // XII Int. conf. "GeoRaman-2016" : abstract volume / compiled and edited by T.A. Alifirova, S.V. Rashchenko, A.V. Korsakov. - Novosibirsk : Офсет, 2016. - P. 25. - References: 2. - The reported study was funded by RFBR according to the research project No.16-02-00102 A and 16-32-00351 mol_a. . - ISBN 978-5-85957-124-6
Аннотация: Elpasolite, one of the rare fluorine minerals, was first found in the “Pikes Peak region”, El Paso County, Colorado, USA (1885). It can be found also in Italy, Greenland, Ukraine and Russia. Single crystal samples of Rb2KB (2)F6 (B (2) = In, Sc, Tb, Ho, Dy) and Rb2NaYF6 were synthesized in laboratory of Crystal Physics, Kirensky Institute of Physics, Krasnoyarsk, Russia. These crystals belong to the perovskite-like crystals with the elpasolite structure A2B(1)B(2)X6 (A and B are metal or rare-earth metal cations, or more complex molecular ions and X are oxygen or halogen anions, high symmetry phase space group Fm3m, Z = 4), which are extensively studied due to their wide variety of distorted structures and exciting complex sequences of phase transitions [1]. The aim of this work is to study structural phase transitions and lattice dynamics (LD) of perovskite-like crystals in the wide pressure range by Raman spectroscopy and semi-empirical LD simulation. Raman spectra were collected using the polarized radiation of a 514.5nm Ar+laser (Spectra-Physics Stabilite 2017) power 15mW on the sample in the wavenumber region between 10 and 1200 cm–1 . The spectra in the 180° geometry were recorded on a Horiba Jobin Yvon T64000 spectrometer. High-pressure experiments were performed in a diamond anvil cell EasyLab μscope DAC–HT(G). To perform LD simulation of investigated compounds the program package LADY was used. So called “hybrid model” [2] was used. This model is a combination of valence force field (VFF) and “rigid-ion” models (RIM). In the pressure range of 0.9 – 1.0 GPa additional lines become visible in the Raman spectra of Rb2KInF6 and Rb2KScF6 crystals. Lattice instability induced by soft phonon mode condensation found at 0.9 GPa for Rb2KInF6 and at 1.0 GPa for Rb2KScF6, that soft mode is associated with displacements of four fluorine atoms from B (2)F6 octahedrons only and corresponds to the rotation of the octahedron as a whole around four-hold axis. Experimental Raman spectra of Rb2NaYF6 is typical for the high symmetry cubic phase of elpasolites under pressure up to 4.33 GPa, numerical simulation shows the absence of phase transition up to 10GPa.

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Доп.точки доступа:
Alifirova, T. A. \ed.\; Rashchenko, S. V. \ed.\; Korsakov, A. V. \ed.\; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Voronov, V. N.; Воронов, Владимир Николаевич; "GeoRaman", International conference(12 ; 2016 ; June ; 9-15 ; Novosibirsk); Российская академия наук; Сибирское отделение РАН; Институт геологии и минералогии им. В.С. Соболева Сибирского отделения РАН
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Flerov, I. N.
Specific heat of the elpasolite Pb2MgWO6 / I. N. Flerov, M. V. Gorev, P. . Sciau // Phys. Solid State. - 1999. - Vol. 41, Is. 9. - P. 1544-1546, DOI 10.1134/1.1131020. - Cited References: 12 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PEROVSKITE PB2MGWO6
Аннотация: The specific heat of Pb2MgWO6 has been measured in the temperature interval 83-370 K. An anomaly in the specific heat associated with the phase transition at T-0=312.8 K has been discovered. The thermodynamic parameters of the structural phase transition Fm3m-Pmcn have been determined. (C) 1999 American Institute of Physics. [S1063-7834(99)03209-8].

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Публикация на русском языке Флеров, Игорь Николаевич. Теплоемкость эльпасолита Pb2MgWO6 [Текст] / И. Н. Флеров, М. В. Горев, Ф. Сью // Физ. тверд. тела. - Санкт-Петербург, 1999. - Т. 41 Вып. 9. - С. 1686-1688

Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
CNRS, Ctr Elaborat Mat & Etud Struct, F-31055 Toulouse, France
ИФ СО РАН

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Sciau, P.; Флёров, Игорь Николаевич
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The p-T phase diagram of ammonium hexafluoroaluminate / M. V. Gorev [et al.] // J. Phys.: Condens. Matter. - 2002. - Vol. 14, Is. 25. - P. 6447-6453, DOI 10.1088/0953-8984/14/25/312. - Cited References: 17 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
NUCLEAR MAGNETIC-RESONANCE
   TRANSITIONS
   MOTIONS
   F-19
   H-1
Кл.слова (ненормированные):
Entropy -- Hydrostatic pressing -- Mathematical models -- Order disorder transitions -- Phase diagrams -- Specific heat of solids -- Ammonium hexafluoroaluminate -- Crolite -- Elpasolite -- Ammonium compounds
Аннотация: The heat capacity and the effect of hydrostatic pressure on structural phase transitions in ammonium hexafluoroaluminate, (NH4)(3)AlF6, have been studied. Two heat capacity anomalies have been found with maxima at T-1 = 218.5 +/- 0.5 K and T-2 = 179 +/- 2 K. Respective entropy changes of phase transitions are DeltaS(1) = 15.3 +/- 0.5 J mol(-1) K-1 and DeltaS(2) = 2.5 +/- 0.5 J mol(-1) K-1. It is shown that the p-T phase diagram of this compound is rather complex and contains a triple point (p(tp) = 0.12 GPa, T-tp = 221 K) and high-pressure phase. The mechanism of transformations and generalized p-T phase diagram for compounds of the (NH4)(3)(MF6)-F-III family are discussed within the framework of the rotational order-disorder model.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Inst Chim Mat Condensee Bordeaux, F-33608 Pessac, France
ИФ СО РАН
L. V. Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Institut de Chimie de la Matiere Condensee de Bordeaux, 33608 Pessac, France

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Tressaud, A.; Durand, E.
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Low-temperature specific heat of the Rb2KScF6 elpasolite / I. N. Flerov [et al.] // Phys. Solid State. - 2003. - Vol. 45, Is. 1. - P. 167-170, DOI 10.1134/1.1537430. - Cited References: 9 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
   CRYOLITE (NH4)(3)SCF6
   DISTORTED PHASES
   SYMMETRY
Аннотация: The specific heat of single-crystal Rb2KScF6 is measured using ac calorimetry in the range 4-280 K. The results are discussed in the context of a group-theoretical analysis of possible distortions of the elpasolite structure and of experimental data obtained earlier with an adiabatic calorimeter in a narrower temperature region. (C) 2003 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Univ Zaragoza, CSIC, Inst Sci Mat Aragon, E-50009 Zaragoza, Spain
ИФ СО РАН
Kirenskii Inst. of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Inst. de Sciencia de Mat. de Aragon, CSIC, Universidad de Zaragoza, Zaragoza 50009, Spain

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Burriel, R.; Gorev, M. V.; Горев, Михаил Васильевич; Isla, P.; Voronov, V. N.; Воронов, Владимир Николаевич
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10.

Lattice dynamics and raman scattering spectrum of elpasolite Rb2KScF6: Comparative analysis / S. N. Krylova [et al.] // Phys. Solid State. - 2004. - Vol. 46, Is. 7. - P. 1311-1319, DOI 10.1134/1.1778457. - Cited References: 18 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
STRUCTURAL PHASE-TRANSITION
   LIGHT-SCATTERING
   OPTICAL PHONONS
   SOFT-MODE
   CRYSTAL
Аннотация: Raman scattering spectra of elpasolite Rb2KScF6 are studied in a wide temperature range including two phase transitions: from the cubic to the tetragonal phase and then to the monoclinic phase. The experimental Raman scattering spectrum is compared with the lattice vibration spectra of these phases calculated using an ab initio approach. A number of anomalies (caused by structural rearrangement during the phase transitions) are revealed and quantitatively analyzed in the ranges of both the intramolecular vibrations of the octahedron molecular ScF6 ions and low-frequency intermolecular lattice vibrations. The interaction between low-frequency intramolecular vibrations and the intermolecular modes is found to be significant, and strong resonance interaction of the rotational soft modes (which are recovered below the phase transition points) with hard low-frequency vibrations of the rubidium ion sublattice is detected. These interactions are shown to substantially complicate the spectra. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Univ Maine, F-72085 Le Mans 9, France
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Universite du Maine, Le Mans, Cedex 9, 72085, France

Доп.точки доступа:
Krylova, S. N.; Крылова, Светлана Николаевна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Bulou, A.; Krylov, A. S.; Крылов, Александр Сергеевич; Zamkova, N. G.; Замкова, Наталья Геннадьевна
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11.

Thermodynamic properties of (NH4)(2)KGaF6 elpasolite / I. N. Flerov [et al.] // Phys. Solid State. - 2001. - Vol. 43, Is. 12. - P. 2301-2306, DOI 10.1134/1.1427960. - Cited References: 19 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
NUCLEAR MAGNETIC-RESONANCE
   PHASE-TRANSITIONS
   CRYOLITE (NH4)(3)SCF6
   MOTIONS
   F-19
   H-1
Аннотация: The heat capacity of (NH4)(2)KGaF6 elpasolite is measured in the temperature range from 80 to 350 K. A sequence of three phase transitions at T-1 = 288.5 K, T-2 = 250 K, and T-3 = 244.5 K is revealed, and the thermodynamic characteristics of these transitions are determined. The influence of hydrostatic pressure on the phase transition temperature is investigated. The results obtained are discussed within the model of orientational ordering of NH4+ and GaF63- ionic groups. (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:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Afanas'ev, M. L.; Ushakova, T. V.
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12.

Soft-mode condensation in Raman spectra of the Rb2KScF6 elpasolite / A. N. Vtyurin [et al.] // Phys. Solid State. - 2001. - Vol. 43, Is. 11. - P. 2154-2157, DOI 10.1134/1.1417197. - Cited References: 11 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
STRUCTURAL PHASE-TRANSITION
SCATTERING
Аннотация: This paper reports on the first observation of soft-mode condensation in the Raman spectra of the Rb2KScF6 elpasolite crystal below the transition points from the cubic to tetragonal and, subsequently, monoclinic phase. (C) 2001 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Univ Maine, F-72085 Le Mans, France
ИФ СО РАН
Kirenskii Inst. of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Universite du Maine, Le Mans, Cedex 9, 72085, France

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Bulou, A.; Krylov, A. S.; Крылов, Александр Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич
}
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13.

Gorev, M. V.
Heat capacity and the p-T phase diagram of Pb2MgTeO6 elpasolite / M. V. Gorev, I. N. Flerov, P. . Sciau // Phys. Solid State. - 2001. - Vol. 43, Is. 2. - P. 345-349, DOI 10.1134/1.1349486. - Cited References: 17 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
ORDERED PEROVSKITE PB2MGTEO6
   CRYSTAL-STRUCTURE
   PB2COWO6
   PB2MGWO6
Аннотация: The heat capacity of Pb2MgTeO6 is measured in the temperature range 80-300 K. It is found that the heat capacity exhibits an anomaly associated with the phase transition at T-0 = 186.9 K. The thermodynamic parameters of the structural transformation are determined. The effect of hydrostatic pressure up to 0.5 GPa on the phase transition temperature is examined. (C) 2001 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
CNRS, Ctr Mat Improvement & Struct Invest, F-31055 Toulouse, France
ИФ СО РАН
Kirenskii Inst. of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
CNRS Ctr. for Mat. I., Tuluza, 31055, France

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Sciau, P.; Горев, Михаил Васильевич
}
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14.

Structure, phase transitions and lattice dynamics of Rb2KInF6 elpasolite / K. S. Aleksandrov, S. V. Misul [et al.] // The 12th International Meeting on Ferroelectricity and 18th IEEE International Symposium on Applications of Ferroelectrics (IMF-ISAF 2009) : Xi'an, China, August 23-27, 2009 . - 2009. - Ст. AP-046

Доп.точки доступа:
Aleksandrov, K.S.; Misul, S.V.; Molokeev, M.S.; Voronov, V.N.; Vtyurin, A.N.; Krylov, A.S.; Krylova, S.; IEEE International Symposium on Applications of Ferroelectrics(18 ; 2009 ; Aug ; Xi'an, China); International Meeting on Ferroelectricity(12 ; 2009 ; Aug ; Xi'an, China)
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15.

Magneto-optical activity of f-f transi?tions in elpasolite Rb2NaDyF6 [Text] / A. V. Malakhovskii, I. S. Edelman, A. L. Sukhachev, V. N. Voronov // Optical Material. - 2009. - Vol.32. - P243-246

Доп.точки доступа:
Malakhovskii, A.V.; Edelman, I.S.; Sukhachev, A.L.; Voronov, V.N.
}
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16.

    Phase transitions and thermodynamic properties of (NH4)(3)VO2F4 cryolite / V. D. Fokina [et al.] // Solid State Sci. - 2009. - Vol. 11, Is. 4. - P. 836-840, DOI 10.1016/j.solidstatesciences.2008.11.004. - Cited Reference Count: 17. - Гранты: The authors are grateful to Dr. SM. Mel'nikova for the permission to use the unpublished results.; This work was supported by the Russian Foundation for Basic Research (project 06-02-16102). - Финансирующая организация: Russian Foundation for Basic Research [06-02-16102] . - ISSN 1293-2558
Рубрики:
PEROVSKITE-LIKE OXYFLUORIDES
   (NH4)(3)TIOF5
   CS
   (NH4)(3)WO3F3
   DIFFRACTION
   (NH4)3VO2F4
   ELPASOLITE
   METALS
   RB
Кл.слова (ненормированные):
Oxyfluorides -- Phase transition -- Calorimetry -- Phase diagram -- Ferroelectricity -- Calorimetry -- Ferroelectricity -- Oxyfluorides -- Phase diagram -- Phase transition -- Calorimetry -- Ferroelectricity -- Halide minerals -- Phase diagrams -- Sugar (sucrose) -- Thermodynamic properties -- Calorimetric measurements -- Cubic phase -- First-order phase transitions -- Heat capacities -- Oxyfluorides -- Phase transition temperatures -- Pressure dependences -- Structural transformations -- Temperature ranges -- Phase transitions
Аннотация: Calorimetric measurements performed in a wide temperature range on (NH4)(3)VO2F4 have shown the presence of four heat capacity anomalies at T-1 = 438 K, T-2 = 244 K, T-3 = 210.2 K, T-4 = 205.1 K associated with the first order phase transitions. In accordance with the permittivity behavior, the structural transformations are of nonferroelectric nature. Pressure dependence of the phase transition temperatures has been studied by DTA under pressure. The entropy of phase transitions is analyzed mainly in the framework of the orientational disordering of NH4+ and VO2F43- ions in a cubic phase. (C) 2008 Elsevier Masson SAS. All rights reserved.

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Держатели документа:
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Gorev, M. V.; Горев, Михаил Васильевич; Kocharova, A. G.; Кочарова, Алла Георгиевна; Flerov, I. N.; Флёров, Игорь Николаевич; Pogoreltsev, E.I.
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17.

Ferroelectric and ferroelastic phase transitions in some oxyfluorides A2AMOxF6-x with elpasolite-cryolite structure [Text] / Flerov I. // 9th Russai/CIS/Baltic/Japan symposium on ferroelectricity : abstracts book : June 15-19, 2008, Vilnius, Lithuania. - p. 113

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(9 ; 2008 ; May ; Vilnus, Lithuania)
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18.

Oxyfluorides with Elpasolite-Cryolite Structure as Materials of Fundamental and Practical Interests / Fokina V.D., Laptash N.M., Flerov I.N. // Advanced inorganic fluorides : the Third International Siberian workshop Intersibfluorine - 2008, September 01-06, 2008, Vladivostok, Russia : proceedings of ISIF-2008. - Vladivostok, 2008. - p. 29-30 . - ISBN 978-5-98128-036-8

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Laptash, N. M.; Flerov, I. N.; Флёров, Игорь Николаевич; "Advanced inorganic fluorides", International Siberian workshop(3 ; 2008 ; SEP. ; Vladivostok)
}
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19.

Luminescence spectra of Ho3+ in a monoclinic elpasolite / Aleksandrovsky Aleksandr Sergeevich[и др.] // Всерос. конф. "Комбинацион. рассеяние - 85 лет исслед." и 4-й Сиб. семинар "Спектроскопия комбинац. рассеяния света" : тезисы докл. : г. Красноярск, 26–29 августа 2013 г. - Красноярск : ИФ СО РАН, 2013. - Ст. 2-7. - С. 13

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Доп.точки доступа:
Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Krylov, A. S.; Крылов, Александр Сергеевич; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Voronov, V. N.; Воронов, Владимир Николаевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; "Комбинационное рассеяние - 85 лет исследований", всероссийская конференция(2013 ; авг. ; 26-29 ; Красноярск); "Спектроскопия комбинационного рассеяния света", сибирский семинар(4 ; 2013 ; авг. ; 26-29 ; Красноярск); Российская академия наук; Научный совет по физике конденсированных сред РАН; Научный совет по спектроскопии атомов и молекул РАН; Сибирское отделение РАН; Объединенный ученый совет по физическим наукам СО РАН; Институт физики им. Л.В. Киренского Сибирского отделения РАН
Нет сведений об экземплярах (Источник в БД не найден)
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20.

EPR study of nanodefects with elpasolite structure [Text] / Voronov V.N., Petrakovskaya E.A. // International Conference "Functional Materials" (ICFM-2011) : Book of abstracts. - 2011. - P85

Доп.точки доступа:
Voronov, V.N.; Petrakovskaya, E.A.; "Functional Materials", International Conference(4 ; 2011 ; Oct. ; 3-8 ; Crimea, Ukraine); "Функциональные материалы", Международная конференция(4 ; 2011 ; Симферополь, Украина)
}
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