Sound velocity change in doped displacive ferroelectrics |
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Authors: | U C Naithani B S Semwal |
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Institution: | (1) Department of Physics, Garhwal University Campus, 246 174 Srinagar;(2) Department of Physics, Garhwal University Campus, 246 001 Pauri |
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Abstract: | 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. |
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Keywords: | Displacive ferroelectrics soft mode sound velocity Curie temperature |
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