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|Title:||Field dependent dielectric study of PbTiO3 and KNbO3 ferroelectric perovskites|
Naithani, U C
|Keywords:||Dielectric constant;Perovskites;Anharmonicity;Green’s function;Hamiltonian|
|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 PbTiO3 and KNbO3 crystals have been studied. Dielectric constant increases with increase in the applied electric field and decreases with increasing temperature in PbTiO3 and KNbO3 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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