Structural aspects in A-site ordered perovskite CaCu3Ti4O12: Colossal dielectric behavior and Ca/Cu disordering

被引：4
|
作者：
Hori, T. [1 ]
Takesada, M. [1 ]
Onodera, A. [1 ]
机构：
[1] Hokkaido Univ, Dept Phys, Fac Sci, Sapporo, Hokkaido 0600810, Japan
来源：
FERROELECTRICS | 2017年 / 513卷 / 01期
关键词：
CCTO; colossal dielectric constant; cation disorder; A-site ordered perovskite; CONSTANT;
D O I：
10.1080/00150193.2017.1350500
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Precise analysis of crystal structure of A-site ordered perovskite CaCu3Ti4O12 was studied at 298, 517 and 785 K, where Ca/Cu disordering is taken into account. The ratio of Ca/Cu disordering is 11% at 785 K, which decreases to 1.7 % at 298 K with decreasing temperature. This Ca/Cu dynamical disordering produces meta-stable intermediate atomic configurations which force to have a polar structure for TiO6 octahedra. This structural heterogeneity may induce an instantaneous dipolar fluctuations and results in a colossal dielectric response, while the average stable state is non-polar.
引用
收藏
页码：72 / 77
页数：6
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