Vacancy ordering in reduced barium titanate
Vacancy ordering in reduced barium titanate
复制标题
DOI：
10.1063/1.1759390
复制
发表时间：
2004-05
影响因子：
4
通讯作者：
D. I. Woodward;I. Reaney;Gaiying Yang;E. Dickey;C. Randall
中科院分区：
文献类型：
--
作者：
D. I. Woodward;I. Reaney;Gaiying Yang;E. Dickey;C. Randall
提出了还原钛酸钡 BaTiO3−δ, δ≈0.33 的晶体结构，该晶体结构是在 Ni-BaTiO3 X7R 多层陶瓷电容器降解过程中形成的。高分辨率透射电子显微镜和选区电子衍射与计算机模拟相结合，表明氧空位在每三个赝立方{111}平面上增加，从而产生具有空间群P3m1的细胞。此外，根据电子能量损失谱，提出 Ti4+ 被还原为 Ti3+ 作为缺氧八面体内电荷补偿的机制。
A crystal structure is proposed for reduced barium titanate, BaTiO3−δ, δ≈0.33, 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.