Record Details

Temperature dependence of dielectric constant and loss tangent in layered antiferroelectric squaric acid crystal

NOPR - NISCAIR Online Periodicals Repository

View Archive Info
 
 
Field Value
 
Title Temperature dependence of dielectric constant and loss tangent in layered antiferroelectric squaric acid crystal
 
Creator Upadhyay, Trilok Chandra
 
Subject Dielectric constant
Pseudospin-phonon interaction
Antiferroelectric
 
Description 157-162
A model of pseudospin for layer type 1 and type 2 for squaric acid crystal proposed by Li and Qin, Ferroelectrics, 82 (1988) 69, has been modified to include pseudospin-phonon interaction and cubic and quartic phonon anharmonic interactions. With the help of double-time temperature dependent Green's function method and modified Hamiltonian, expressions for antiferroelectric soft mode frequency, dielectric constant, loss and transition temperature have been evaluated. By fitting model values of physical quantities in the theoretical expressions, temperature dependence of soft mode, dielectric constant and loss has been calculated in the vicinity of transition temperature. Theoretical results have been compared with experimental results of Muser (Ref. 6), Maier et al. ⁵ and Samara and Semmingsen (Ref. 9), which show a good agreement.
 
Date 2008-10-24T09:50:10Z
2008-10-24T09:50:10Z
2007-02
 
Type Article
 
Identifier 0019-5596
http://hdl.handle.net/123456789/2300
 
Language en_US
 
Relation C30B
 
Publisher CSIR
 
Source IJPAP Vol.45(2) [February 2007]