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IJPAP Vol.42(01) [January 2004] >


Title: Sound velocity change in BaxSr1-xTio3 perovskites
Authors: Kumar, Ashok
Naithani, U C
Semwal, B S
Keywords: Sound velocity change
Ferroelectric perovskites
Anharmonicity
Issue Date: Jan-2004
Publisher: CSIR
Abstract: An expression for the sound velocity change in anharmonic BaxSr1-xTiO3 ferroelectric crystal is obtained, by using double time temperature dependent Green’s function technique. We have considered higher order anharmonic terms in modified Silverman Hamiltonian for it. The defect and anharmonic contributions to the change in sound velocity are separately discussed. The sound velocity decreases anomalously in the vicinity of the Curie temperature. The presence of higher order anharmonicity decreases the sound velocity. It varies with temperature and the sound velocity decreases with addition of defect (concentration x) in BaxSr1-xTiO3.
Page(s): 18-24
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.42(01) [January 2004]

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