SOFT MODE AND ITS ELECTRONIC POTENTIAL IN SbSI-TYPE MIXED CRYSTALS

被引：26
|
作者：
Kvedaravicius, S. [1 ]
Audzijonis, A. [1 ]
Mykolaitiene, N. [2 ]
Grigas, J. [3 ]
机构：
[1] Vilnius Pedag Univ, Dept Phys, Studentu 39, LT-2034 Vilnius, Lithuania
[2] Vilnius Tech Univ, Dept Fundamental Sci, LT-2054 Vilnius, Lithuania
[3] Vilnius Univ, Fac Phys, LT-2054 Vilnius, Lithuania
来源：
FERROELECTRICS | 1996年 / 177卷 / 01期
关键词：
Electronic potential in SBSI-type mixed crystal;
D O I：
10.1080/00150199608223627
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The paper presents the results of ferroelectric dispersion at microwaves and of calculation of electronic potential dependence upon normal coordinates of B-1u mode in paraelectric and ferroelectric phases in SbSI- type mixed crystals. Obtained large anharmonicity of the electronic potential at Sb (or Bi) site confirms the splitting of the soft B-1u mode, the main component of which causes the ferroelectric dispersion at microwaves. Dependence of the electronic potential on composition revealed all factors which change the temperature of phase transition and the soft mode dynamics. It also explains why the pure SbSeI, BiSI and BiSeI are not ferroelectrics.
引用
收藏
页码：181 / 190
页数：10
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