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Title: Electric field dependent sound velocity change in Ba1−xCaxTiO3 ferroelectric perovskites
Authors: Pradeep, Dushyant
Naithani, U C
Kumar, A
Keywords: Green’s function
Sound velocity
Ferroelectric perovskites
Issue Date: Feb-2011
Publisher: NISCAIR-CSIR, India
Abstract: By using double time temperature dependent Green’s function technique, an expression for the sound velocity change in the mixed crystal perovskites (Ba1−xCaxTiO3) has been obtained with the help of the modified Silverman-Joseph Hamiltonian. Third- and fourth-order anharmonic and electric moment terms in the modified Hamiltonian for Ba1−xCaxTiO3 crystal perovskites have been considered. The effect of defect, electric field and anharmonic contributions on velocity change in Ba1−xCaxTiO3 for paraelectric phase has been studied. The presence of higher order anharmonicity and electric moment terms decreases the sound velocity. In the vicinity of the phase transition, it decreases as the consequence of the soft mode. It also varies with electric field and defect concentration in Ba1−xCaxTiO3.
Description: 132-136
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.49(02) [February 2011]

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