Thermodynamic Properties of Vanadium Oxypentafluoride (IV) (NH4)3VOF5 | Научно-инновационный портал СФУ

Thermodynamic Properties of Vanadium Oxypentafluoride (IV) (NH4)3VOF5

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.1134/S1063783420070057

Ключевые слова: birefringence, oxyfluorides, phase transitions, pressure susceptibility, specific heat, thermal expansion

Аннотация: Abstract: The (NH4)3VOF5 crystals have been synthesized and their homogeneity and single-phase structure has been established by the X-ray diffraction, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy studies. The investigations of the temperature dependences of specific heat, entropy, strain, and pressure susceptibility show the occurrence of three phase transitions caused by the structural transformations in the (NH4)3VOF5 crystals. The T–p phase diagram shows the temperature limits of stability of the crystalline phases implemented in (NH4)3VOF5. The optical and dielectric studies disclose the ferroelastic nature of the phase transitions. An analysis of the experimental data together with the data on the isostructural (NH4)3VO2F4 crystal makes it possible to distinguish the physical properties of oxyfluorides containing vanadium of different valences (IV and V). © 2020, Pleiades Publishing, Ltd.

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Издание

Журнал: Physics of the Solid State

Выпуск журнала: Vol. 62, Is. 7

Номера страниц: 1271-1279

ISSN журнала: 10637834

Авторы

  • Bogdanov E.V. (Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia; Krasnoyarsk State Agr Univ, Inst Engn Syst & Power, Krasnoyarsk 660049, Russia)
  • Pogoreltsev E.I. (Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)
  • Kartashev A.V. (Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia)
  • Gorev M.V. (Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)
  • Molokeev M.S. (Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)
  • Mel'nikova S.V. (Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia)
  • Flerov I.N. (Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)
  • Laptash N.M. (Russian Acad Sci, Inst Chem, Far Eastern Branch, Vladivostok 690022, Russia)

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