Pressure-induced disappearance of the local rhombohedral distortion in BaTiO3

被引：59

作者：

Itié, JP

Couzinet, B

Polian, A

Flank, AM

Lagarde, P

机构：

[1] Univ Paris 06, CNRS, UMR 7590, IMPMC, F-75015 Paris, France

[2] CNRS, LOrme Merisiers St Aubin UR1, Synchrotrton SOLEIL, F-91192 Gif Sur Yvette, France

来源：

EUROPHYSICS LETTERS | 2006年 / 74卷 / 04期

关键词：

D O I：

10.1209/epl/i2006-10020-2

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

BaTiO3 has been studied by X-ray absorption spectroscopy at the Ti K edge up to 19GPa in a diamond anvil cell at room temperature. The pre-edge features observed at the Ti K edge are sensitive to the pressure. It is shown that the high-pressure cubic phase obtained above 2 GPa is similar to the high-temperature one, with titanium out of the centre of the oxygen octahedron. Between 2 and 10 GPa the intensity of the pre-edge features decreases indicating that the Ti atom is moving toward the centre of the oxygen octahedron. Above 10 GPa, the features do not change anymore, showing that the Ti atom is at the centre of the oxygen octahedron. No correlation between the Ti atom position and the Raman activity under pressure is observed.

引用

页码：706 / 711

页数：6

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