Vacancy ordering in reduced barium titanate

被引：110
|
作者：
Woodward, DI
Reaney, IM
Yang, GY
Dickey, EC
Randall, CA
机构：
[1] Univ Sheffield, Dept Mat Engn, Sheffield S1 3JD, S Yorkshire, England
[2] Penn State Univ, Ctr Dielect Studies, Mat Res Lab, University Pk, PA 16802 USA
来源：
APPLIED PHYSICS LETTERS | 2004年 / 84卷 / 23期
关键词：
D O I：
10.1063/1.1759390
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A crystal structure is proposed for reduced barium titanate, BaTiO3-delta, deltaapproximate to0.33, formed during the degradation of Ni-BaTiO3 X7R multilayer ceramic capacitors. High-resolution transmission electron microscopy and selected-area electron diffraction have been used in combination with computer simulations to show that oxygen vacancies accrete on every third pseudocubic {111} plane, resulting in a cell with space group P3m1. Additionally, from electron energy loss spectroscopy, it is proposed that Ti4+ is reduced to Ti3+ as a mechanism of charge compensation within oxygen-deficient octahedra. (C) 2004 American Institute of Physics.
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页码：4650 / 4652
页数：3
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