STATISTICAL THEORY FOR DISPLACEMENT FERROELECTRICS .3. COMPARISON WITH EXPERIMENT FOR LITHIUM TANTALATE

被引:37
作者
LINES, ME
机构
[1] Bell Telephone Laboratories, Murray Hill, NJ
来源
PHYSICAL REVIEW | 1969年 / 177卷 / 02期
关键词
D O I
10.1103/PhysRev.177.819
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The theory developed in parts I and II of the present series of papers is used to interpret the dielectric properties of LiTaO3. The problem is comfortably overdetermined, allowing both for a determination of the parameters involved in the theory and for a consistency check of the theory itself. The agreement between theory and experiment is quite good using completely temperature-independent parameters, but becomes excellent if a temperature dependence of the Lorentz field parameter is allowed. When the values obtained for the parameters of the effective Hamiltonian are related to a detailed description of the system in terms of a microscopic model, it becomes apparent that a representation in terms of a set of effective point charges at the various nuclear sites is inadequate. It is suggested that a representation of each ion by two effective charges, a core charge and a shell charge, may be more appropriate. © 1969 The American Physical Society.
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页码:819 / &
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