Authors: Kumar, A.; Naithani, U.C.; Semwal, B.S.

Source: British Ceramic Transactions, Volume 103, Number 4, August 2004 , pp. 153-157(5)

Publisher: Maney Publishing

Abstract:

The specific heat of an anharmonic Ba_xSr_1—xTiO₃ ferroelectric crystal is calculated in its paraelectric phase from the Silverman–Joseph Hamiltonian augmented with fourth order phonon coordinates using double time Green's functions. The soft mode contribution to specific heat is described by appropriate Einstein terms. The variation of specific heat with temperature and defect parameters is discussed. The effect of defects on specific heat can be observed in the presence of anharmonicity. Around the Curie temperature the Cochran soft mode is held to be responsible for the anomalous behaviour of specific heat.

Keywords: DEFECTS; SPECIFIC HEAT AT CONSTANT VOLUME; SOFT MODE FREQUENCY; ANHARMONICITY; CURIE TEMPERATURE; BARIUM STRONTIUM TITANATE

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/096797804225018660

Publication date: 2004-08-01

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