Pressure-induced tricritical phase transition from the scheelite structure to the fergusonite structure in LiLuF4

被引：35

作者：

Grzechnik, A

Friese, K

Dmitriev, V

Weber, HP

Gesland, JY

Crichton, WA

机构：

[1] Univ Basque Country, Dept Fis Mat Condensada, E-48080 Bilbao, Spain

[2] European Synchrotron Radiat Facil, Swiss Norwegian Beamlines, Grp Struct Mat Extreme Condit, F-38043 Grenoble, France

[3] Ecole Polytech Fed Lausanne, EPFL, SB, IPMC,LCR,Lab Cristallog, CH-1015 Lausanne, Switzerland

[4] Univ Maine Cristallogenese, F-72075 Le Mans, France

[5] European Synchrotron Radiat Facil, F-38043 Grenoble, France

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2005年 / 17卷 / 04期

关键词：

D O I：

10.1088/0953-8984/17/4/018

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

LiLuF4 scheelite(I4(1)/a, Z = 4) has been investigated at high pressures using synchrotron angle-dispersive x-ray powder diffraction in a diamond anvil cell at room temperature. At 10.7 GPa, it reversibly undergoes a tricritical phase transition to the fergusonite structure (C12/c1, Z = 4), a distorted modification of the scheelite type. No other phase occurs in this material up to 19.5 GPa, the highest pressure in this study. Such a high-pressure behaviour is compared with the pressure-induced transformations in LiYF4 and LiGdF4, adding on to our knowledge of the structural systematics in LiMF4 compounds.

引用

页码：763 / 770

页数：8

共 24 条

[1] VARIANTS OF CATION ARRANGEMENT IN THE 3(6)-NET OF TANTALATES AND NIOBATES WITH 1/1-STOICHIOMETRY [J].