摘要
在A(B_(0.5)~1B_(0.5)~2)O_3钙钛矿型铁电陶瓷材料中,除了在较高温度下都能有稳定的<111>型超格子有序结构外,在室温和-150℃情况下,还分别观察到1/2<110>和1/2<100>型超格子有序结构,本文引入长程相互作用,并利用8点集团变分模型,在不同温度范围内分析了前面三种有序态的稳定性,所得结论与实验结果一致。
In A(B_(0.5)~1 B_(0.5)~2)O3 perovskite-like ferroelectrics. besides the stable 1/2 〈lll〉-type
ordered structure, two new kinds oi ordered structures, 1/2 〈110〉 and 1/2〈100〉 super
lattices, have been observed at room temperature and -150℃ respectively. In this paper, the longrange interactions are introduced into the eight-point cluster variation method to analyse the stabilities of the three kinds of ordered structures. The results are in good agreement with experimental observations.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第3期498-504,共7页
Acta Physica Sinica
