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Title: Temperature dependence of width and soft mode frequency in sodium potassium tantalate mixed system
Authors: Uniyal, Manish
Bhatt, S C
Keywords: Model Hamiltonian;Dielectric Constant;Soft Mode Frequency;Width
Issue Date: Apr-2012
Publisher: NISCAIR-CSIR, India
Abstract: Considering a quadratic anharmonic model Hamiltonian and using Green's function and Dyson’s equation technique, expressions for the width in the frequency response for mixed perovskite type ferroelectrics and soft mode frequency have been obtained. Using the experimentally observed dielectric constant and loss tangent for Na1-xKxTaO3 (where x = 0, 0.2, 0.4, 0.5 and 0.6) the temperature dependence of soft mode width and frequency in these samples at 10 kHz has been calculated.
Page(s): 248-251
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.50(04) [April 2012]

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