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IJPAP Vol.48(04) [April 2010] >


Title: Dependence of specific heat on electric field in Ba1-xCaxTiO3 ferroelectric perovskites
Authors: Pradeep, Dushyant
Kumar, Ashok
Naithani, U C
Keywords: Anharmonicity
Curie temperature
Defects
Soft mode frequency
Specific heat
Ferroelectric perovskites
Issue Date: Apr-2010
Publisher: CSIR
Abstract: The electric field dependence of the specific heat of an anharmonic Ba1-xCaxTiO3 ferroelectric crystal has 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 described 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 to be responsible for the anomalous behaviour of specific heat.
Page(s): 276-281
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.48(04) [April 2010]

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