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Displacive ferroelectrics; soft mode; sound velocity; Curie temperature

An expression is obtained for the sound velocity change in doped displacive ferroelectrics, in the presence of an electric field by considering higher order anharmonic terms in the modified Silverman-Joseph Hamiltonian. The mass and force constant changes due to impurity may give cancellation effects. The presence of higher order anharmonicity decreases the sound velocity which in turn varies with the applied electric field. The sound velocity decreases anomalously near the Curie temperature.

U C Naithani^{1 2} B S Semwal¹

1. Department of Physics, Garhwal University Campus, Srinagar - 246 174
2. Department of Physics, Garhwal University Campus, Pauri - 246 001

Published

January 1980

Manuscript received

12 October 1978

Manuscript revised

27 August 1979