A NEW STRUCTURAL MODEL FOR LITHIUM-NIOBATE

被引:2
作者
VYAS, JC
KOTHIYAL, GP
GHOSH, B
GUPTA, MK
机构
[1] Bhabha Atomic Research Centre, Technical Physics and Prototype Engineering Division, Bombay
[2] Calcutta, 700027, Flat No. 34, 30, Belvedere Road Alipur
关键词
D O I
10.1002/crat.2170300216
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
A new model based on the crystal field theory is proposed for LiNbO3. According to this the central position of the Nb ions in oxygen octahedra is energetically unstable leading to the splitting of the potential energy curve into the one having two equivalent off-centered minima. The phase transition temperature T-c is related to the average height of the barrier existing between these energy minima. The model explains satisfactorily some of the properties of LiNbO3 in the paraelectric and ferroelectric phases, which were not fully understood by earlier models.
引用
收藏
页码:217 / 222
页数:6
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