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Title: Field dependent dielectric study of PbTiO<sub>3</sub> and KNbO<sub>3</sub> ferroelectric perovskites
Authors: Singh, Talvinder
Kumar, Ashok
Naithani, U C
Keywords: Dielectric constant
Green’s function
Issue Date: Jan-2010
Publisher: CSIR
Abstract: An expression has been obtained for the complex dielectric constant in anharmonic pure ferroelectric crystals using double time temperature dependent Green’s function technique along with a modified Hamiltonian which includes anharmonicity up to the fourth order due to the interactions of the soft mode. The electric field, temperature and frequency dependent dielectric constant of PbTiO<sub>3</sub> and KNbO<sub>3</sub> crystals have been studied. Dielectric constant increases with increase in the applied electric field and decreases with increasing temperature in PbTiO<sub>3</sub> and KNbO<sub>3</sub> crystals. Anharmonicity is necessary in these crystals to observe these effects.
Description: 47-51
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.48(01) [January 2010]

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