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

被引：22

作者：

Fokina, V. D. ^{[1
,2
]}

Flerov, I. N. ^{[1
,2
]}

Molokeev, M. S. ^{[1
]}

Pogorel'tsev, E. I. ^{[2
]}

Bogdanov, E. V. ^{[1
]}

Krylov, A. S. ^{[1
]}

Bovina, A. F. ^{[1
]}

Voronov, V. N. ^{[1
]}

Laptash, N. M. ^{[3
]}

机构：

[1] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Akad Gorodok, Krasnoyarsk 660036, Russia

[2] Siberian Fed Univ, Krasnoyarsk 660074, Russia

[3] Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia

来源：

PHYSICS OF THE SOLID STATE | 2008年 / 50卷 / 11期

基金：

俄罗斯基础研究基金会;

关键词：

61; 50; Ks; 65; 40; Ba; gd; 78; 30; Hv; 81; Dz;

D O I：

10.1134/S1063783408110280

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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.

引用

页码：2175 / 2183

页数：9

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