Field dependent soft mode frequency in BaxSr1-xTiO3 ferroelectric perovskites

被引：0
作者：
Kumar, Ashok [1 ]
Kukreti, Ashish [1 ]
Naithani, U. C. [1 ]
机构：
[1] Garhwal Univ Pauri, Dept Phys, Garhwal 246001, Uttarakhand, India
来源：
INDIAN JOURNAL OF PURE & APPLIED PHYSICS | 2009年 / 47卷 / 04期
关键词：
Soft mode frequency; Ferroelectric perovskites; Green's function; Anharmonicity; MICROWAVE-ABSORPTION; TEMPERATURE; LOSSES;
D O I：
暂无
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
An expression has been obtained for the soft mode frequency in BixSi1-xTiO3 ferroelectric perovskites in the presence of external electric Field, by Using double time temperature dependent Green's function technique. The mass and force constant change due to impurity atoms which are taken into account in the presence of higher order anharmonic and electric moment terms in the Silverman Joseph Hamiltonian. The soft mode frequency is obtained in the presence of both the electric field and impurity of Ba in an anharmonic SrTiO3 ferroelectric perovskites. The Soft mode frequency decreases with increase of impurity concentration of Ba in pure SrTiO3. The soft mode frequency also increases with increase of external electric field in BaxSr1-xTiO3 ferroelectric perovskites.
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页码：300 / 305
页数：6
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