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IJPAP Vol.50(03) [March 2012] >


Title: Temperature dependence of antiferroelectric mode frequency, dielectric constant and loss tangent of ADP crystal in presence of electric field
Authors: Upadhyay, Trilok Chandra
Joshi, Deepak
Keywords: Antiferroelectrics
Anharmonic Interactions
Green Function
Electric Field
Issue Date: Mar-2012
Publisher: NISCAIR-CSIR, India
Abstract: A four sub-lattice pseudospin lattice coupled mode model modified with third and fourth-order phonon anharmonic interaction terms and external electric field terms has been considered for ADP crystal. Expressions for shift, width, renormalized antiferroelectric mode frequency, dielectric constant and loss tangent have been evaluated. Double-time thermal Green's function method has been used for derivation. Fitting the values of model parameters in expressions, the temperature dependence of antiferroelectric mode frequency dielectric constant and loss tangent has been calculated in the presence of electric field. Theoretical results agree well with data reported by Okada et al. [Okada K, Sugie E, Kanno K & Tada K, J Phys Soc Japan, 43 (1977) 557.]
Page(s): 167-174
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.50(03) [March 2012]

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