X-ray absorption spectroscopy on titanate perovskites at the TiK edge

被引：13
|
作者：
Itie, J. P.
Couzinet, B.
Dhaussy, A. C.
Flank, A. M.
Jaouen, N.
Lagarde, P.
Polian, A.
机构：
[1] Synchrotron SOLEIL, F-91192 Gif Sur Yvette, France
[2] Univ Paris 06, IMPMC, CNRS, UMR 7590, F-75015 Paris, France
[3] ENSI CAEN, CRISMAT, F-14050 Caen, France
来源：
HIGH PRESSURE RESEARCH | 2006年 / 26卷 / 04期
关键词：
ferroelectric instability; titanate perovskites; TiK-XANES; high pressure;
D O I：
10.1080/08957950601105556
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The Ti K edge X-ray absorption has been measured under high pressure at room temperature for ATiO(3) perovskites (A = Ca, Sr, Ba and Pb). The pre-edge features have been used to determine the local distortion around the Ti atom as a function of applied features. The ferroelectric local instability decreases when pressure is increased (PbTiO3) and eventually vanishes at high pressure (BaTiO3). The antiferrodistorsive instability remains unchanged under pressure for CaTiO3 and appears above 5 GPa for SrTiO3. Moreover, it is shown that at room pressure SrTiO3 was locally ferroelectric. A new phase appears for SrTiO3 above 14 GPa with a strong deformation of the oxygen octahedron.
引用
收藏
页码：325 / 330
页数：6
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