Lattice dynamical studies of ternary superionic conductors Ag3SX (X=I, Br)

被引：0
|
作者：
Sinha, MM [1 ]
Wakamura, K [1 ]
机构：
[1] Sant Longowal Inst Engn & Technol, Dept Phys, Longowal 148106, Sangrur, India
来源：
INDIAN JOURNAL OF ENGINEERING AND MATERIALS SCIENCES | 2000年 / 7卷 / 5-6期
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中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A de Launey angular force model has been applied to study the phonon dispersion in three symmetric directions of ternary superionic conductor Ag3SX (X = I, Pr) by assuming them to be ideal perovskite type structure. A lattice dynamical calculation reasonably interprets the dominance of mobile ions in highest frequency mode. The short-range (f(S)) acid long-range (f(L)) forces in Ag3SX (X = I, Br) for a high frequency band are estimated near the transition temperature T-c and below 300 K. The f(L) values in both the conductors show an increase with T above T-c whereas the values of f(s) decrease with T. The temperature dependence of f(L) and f(S) are explained satisfactorily from this calculation.
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页码：385 / 389
页数：5
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