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Temperature dependence of microwave loss in ADP-type crystals

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Title Temperature dependence of microwave loss in ADP-type crystals
 
Creator Upadhyay, Trilok Chandra
 
Subject Antiferroelectrics
Anharmonic interactions
Dielectric
Loss tangent
 
Description 66-72
By using four sublattice pseudospin lattice coupled mode model along with third and fourth-order phonon anharmonic interaction terms for ADP-type crystals, expressions for shift, width, renormalized soft mode frequency, dielectric constant and loss have been evaluated. The method of double-time thermal Green's function has been used for calculation. Fitting the values of model parameters in expressions, the temperature dependences of soft mode frequency and loss have been calculated. In the microwave frequency range, an increase in frequency is followed by increase in loss. The loss decreases with increase in temperature for ADP crystal in its paraelectric phase. This shows Curie-Weiss behaviour of the dielectric tangent loss. Theoretical results are compared with experimental results of Nagamiya [Progr Theor Phys, 7 (1952) 275] and Busch, Helv Phys Acta, 11 (1938) 269]. A good agreement has been found.
 
Date 2009-02-18T04:09:45Z
2009-02-18T04:09:45Z
2009-01
 
Type Article
 
Identifier 0019-5596
http://hdl.handle.net/123456789/3134
 
Language en_US
 
Publisher CSIR
 
Source IJPAP Vol.47(1) [January 2009]