Determination of the local structure of NbO6 octahedra in the orthorhombic phase of a KNbO3 crystal using EXAFS

被引：6

作者：

Bugaev, LA ^{[1
]}

Shuvaeva, VA ^{[1
]}

Alekseenko, IB ^{[1
]}

Zhuchkov, KN ^{[1
]}

Vedrinskii, RV ^{[1
]}

机构：

[1] Rostov Don State Univ, Rostov On Don 344090, Russia

来源：

PHYSICS OF THE SOLID STATE | 1998年 / 40卷 / 06期

关键词：

D O I：

10.1134/1.1130466

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A new method proposed by us to determine the displacement direction of B atoms from centrosymmetric positions in ABO(3) crystals is used to study the local atomic structure of KNbO3 in the orthorhombic phase. It is shown that the conventional treatment of the EXAFS yields serious errors in determinations of the local distortions of NbO6 octahedrons. To eliminate these errors, it is suggested that diffraction data on the average atomic displacements should be combined with the results of direct calculations of the Nb K-EXAFS of KNbO3 in the orthorhombic phase. This approach was used to establish that the preferential direction of displacement of Nb in the orthorhombic phase of KNbO3 is in the direction of the polar twofold axis. (C) 1998 American Institute of Physics.

引用

页码：1001 / 1005

页数：5