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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.48 [2010] >
IJPAP Vol.48(05) [May 2010] >
| Title: | Field dependent sound attenuation in PbTiO3 and KNbO3 ferroelectric perovskites |
| Authors: | Singh, Talvinder
Kumar, Ashok
Naithani, U C |
| Keywords: | Sound attenuation
Anharmonicity
Ferroelectric perovskites
Green’s function
Soft mode |
| Issue Date: | May-2010 |
| Publisher: | CSIR |
| 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. |
| Page(s): | 343-348 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.48(05) [May 2010]
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