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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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Inelastic neutron scattering study of the specific features of the phase transitions in (NH4)(2)WO2F4 / L. S. Smirnov [et al.] // Phys. Solid State. - 2009. - Vol. 51, Is. 11. - P. 2362-2366, DOI 10.1134/S1063783409110262. - Cited References: 15. - This study was supported by the Russian Foundation for Basic Research (project no. 09-02-00062) and the ORNL/SNS controlled by UT-Battelle, LLC, the U.S. Department of Energy (contract DE-AC05-00OR22725); the experiments in the Argonne National Laboratory were supported by the Office of General Sciences on Energy, Division of Materials Science of the U.S. Department of Energy (contract DE-AC02-06CH11357). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
OXYFLUORIDE
   (NH4)(3)WO3F3
   MECHANISM
   RB
   CS
Аннотация: Oxyfluoride (NH4)(2)WO2F4 has been studied by the inelastic neutron scattering method over a wide temperature range 10-300 K at two initial neutron energies of 15 and 60 meV. The role of tetrahedral ammonium groups in the mechanism of sequential phase transitions at T (1) = 201 K and T (2) = 160 K has been discussed.

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Держатели документа:
[Smirnov, L. S.] Alikhanov Inst Theoret & Expt Phys, Moscow 117218, Russia
[Kolesnikov, A. I.] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA
[Flerov, I. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Flerov, I. N.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far Eastern Branch, Vladivostok 690022, Russia
ИФ СО РАН

Доп.точки доступа:
Smirnov, L. S.; Kolesnikov, A. I.; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.; Russian Foundation [09-02-00062]; U.S. Department of Energy [DE-AC05-00OR22725, DE-AC02-06CH11357]
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    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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