Structural changes and pressure-induced amorphization in rare earth titanates RE2Ti2O7 (RE: Gd, Sm) with pyrochlore structure

被引：81

作者：

Zhang, FX ^{[1
]}

Saxena, SK ^{[1
]}

机构：

[1] Florida Int Univ, CESMEC, Miami, FL 33199 USA

来源：

CHEMICAL PHYSICS LETTERS | 2005年 / 413卷 / 1-3期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/j.cplett.2005.07.094

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Structural changes of pyrochlore titanates, Sm2TiO7 and Gd2Ti2O7, at high pressures were studied by in situ Raman scattering and X-ray diffraction (XRD) methods. The Raman experiments revealed that RE2Ti2O7 lost pyrochlore structural character at pressures of 40 GPa and 38 GPa for RE = Sm and Gd, respectively. However, XRD results found that they were only partially amorphized up to 51 GPa. The crystalline phase at high pressure is a distorted pyrochlore - the anions have lost long-range order while the rare earth ions still keep some ordering. Both of the pyrochlores became completely amorphous after releasing pressure from 51 GPa. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：248 / 251

页数：4

共 17 条

[1] Local lattice disorder in the geometrically frustrated spin-glass pyrochlore Y2Mo2O7 [J].