Distortion of GdFeO3-type perovskites with pressure: A study of YAlO3 to 5 GPa

被引：36

作者：

Ross, NL

机构：

[1] Department of Geological Sciences, University College London, London WC1E 6BT, Gower Street

来源：

PHASE TRANSITIONS | 1996年 / 58卷 / 1-3期

关键词：

high pressure; perovskites; X-ray diffraction;

D O I：

10.1080/01411599608242392

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The crystal structure of orthorhombic (Pbnm) YAlO3 perovskite has been investigated between 0 and 4 GPa using single-crystal X-ray diffraction in a diamond anvil cell. The compression of the structure is anisotropic with beta(a) = 1.40(4) x 10(-3) GPa(-1), beta(b) = 1.99(6) x 10(-3) GPa(-1) and beta(c) = 1.52(5) x 10(-3) GPa(-1). The dominant compression mechanism involves shortening of the octahedral Al-O bond, but the compression of the octahedra is counteracted by increased interoctahedral tilting in the be-plane. The octahedral tilting results in expansion of the YO12 site relative to the AlO6 site (B-dod < beta(oct)). The distortion of the structure decreases slightly with pressure, and the distortion of the AlO6 octahedra also decreases with pressure. The implications for other GdFeO3-type perovskites is discussed.

引用

页码：27 / 41

页数：15

共 31 条

[1] STRUCTURE OF ORTHORHOMBIC SRZRO3 BY NEUTRON POWDER DIFFRACTION [J].