Dielectric properties of order-disorder type crystals
Green’s function; Dyson’s equation; phonon anharmonicity; transverse and observed dielectric constant; and tangent loss
Abstract
The soft mode dynamical model has been used to study the dielectric properties of orderdisorder-type crystals. Using the model Hamiltonian proposed by Blinc [Advances in Phys, 29 (1972) 701] and has been modified by Bist et al [GJSFR,10,18(2010)], the expressions for the dielectric constant and tangent loss have been derived and discussed for order-disorder, KH2PO4 type-crystals with the help of double time temperature dependent Green's function techniques and Dyson's equation treatment. Using appropriate parameters given by Ganguli et al [Phys Rev. B21, 2937 (1980)] the transverse dielectric constant and observed dielectric constant have been calculated and compared with experimental results of Raman Intensity [Ferroelectrics 52, 91
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2012-07-02
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