Heat capacity, p-T phase diagram, and structure of Rb2KTiOF5

Описание

Тип публикации: статья из журнала

Год издания: 2008

Идентификатор DOI: 10.1134/S1063783408110280

Ключевые слова: 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) =Показать полностью215 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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Издание

Журнал: PHYSICS OF THE SOLID STATE

Выпуск журнала: Vol. 50, Is. 11

Номера страниц: 2175-2183

ISSN журнала: 10637834

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

Авторы

  • Fokina V.D. (Siberian Federal University)
  • Flerov I.N. (Siberian Federal University)
  • Molokeev M.S. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)
  • Bogdanov E.V. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)
  • Krylov A.S. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)
  • Bovina A.F. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)
  • Voronov V.N. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)
  • Pogorel'Tsev E.I. (Siberian Federal University)
  • Laptash N.M. (Institute of Chemistry,Far East Division,Russian Academy of Sciences)

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