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|Title:||Field dependent sound attenuation in PbTiO3 and KNbO3 ferroelectric perovskites|
Naithani, U C
|Keywords:||Sound attenuation;Anharmonicity;Ferroelectric perovskites;Green’s function;Soft mode|
|Abstract:||The electric field dependence of the sound attenuation in anharmonic pure PbTiO3 and KNbO3 ferroelectric perovskites has been theoretically calculated in paraelectric phase from the Silverman-Joseph Hamiltonian augmented with fourth-order phonon coordinates using double-time Green’s function technique. The attenuation constant increases with increasing temperature and frequency in the presence of an electric field. In the vicinity of phase transition temperature, the anomalously increasing sound attenuation is the consequence of soft mode. The attenuation of sound wave is primarily due to strong interaction with thermally excited phonons in the soft mode. The results obtained are compared with the results of others.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.48(05) [May 2010]|
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