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|Title:||Field dependent dielectric study of PbTiO<sub>3</sub> and KNbO<sub>3</sub> ferroelectric perovskites|
Naithani, U C
|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.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.48(01) [January 2010]|
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