Please use this identifier to cite or link to this item:
Title: Temperature dependence of dielectric constant and loss tangent in layered antiferroelectric squaric acid crystal
Authors: Upadhyay, Trilok Chandra
Keywords: Dielectric constant
Pseudospin-phonon interaction
Issue Date: Feb-2007
Publisher: CSIR
Series/Report no.: C30B
Abstract: 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.
Description: 157-162
ISSN: 0019-5596
Appears in Collections:IJPAP Vol.45(02) [February 2007]

Files in This Item:
File Description SizeFormat 
IJPAP 45(2) 157-162.pdf123.25 kBAdobe PDFView/Open

Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.