科研之友
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摘要
The electric field dependence of the specific heat of an anharmonic Ba1-xCaxTiO3 ferroelectric crystal his been calculated in its paraelectric phase from Silverman-Joseph Hamiltonian augmented with fourth order phonon coordinates using double times Green's functions. The electric field dependent soft mode contribution to the specific heat is ascribed by appropriate Einstein terms. The variation of the specific heat with temperature and defect parameters has been discussed for different values of field strengths. The effect of defects on specific heat can be observed in the presence of anharmonicity. The specific heat decreases with increase in external field and increases with increase in temperature which is in agreement with the previous results. As the Curie temperature is approached, the Cochran soft mode is held Lobe responsible for the anomalous behaviour of specific heat.
- 出版日期2010-4
