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Dielectric Behavior and Phonon Damping in Low-Dielectric Constant Perovskite Materials

Published online by Cambridge University Press:  10 February 2011

Ram S. Katiyar ,
Igor Siny ,
R. Guo  and
A. S. Bhalla
Ram S. Katiyar
Affiliation:
University of Puerto Rico, Dept of Physics, San Juan, PR 00931
Igor Siny
Affiliation:
University of Puerto Rico, Dept of Physics, San Juan, PR 00931
R. Guo
Affiliation:
Penn State Univ, Material Research Lab, University Park, PA 16802
A. S. Bhalla
Affiliation:
Penn State Univ, Material Research Lab, University Park, PA 16802
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Abstract

We have carried out a comparative study of the dielectric losses in some complex perovskites with both 1:1 and 1:2 compositions of the B ions, namely, SrAl1/2Nb1/2O3 (SAN), SrAl1/2Ta1/2O3 (SAT) and BaMg1/3Ta2/3O3 (BMT). The samples were prepared in two forms, viz. ceramics and single-crystal fibers, the latter were grown by laser heated pedestal growth technique (LHPG). All of these materials possess low dielectric constants, low losses and high Q values. In contrast to relaxor ferroelectrics, that as a rule exhibit broad features in their Raman spectra, SAN, SAT and especially BMT have very narrow phonon lines in the Raman spectra. A linear correlation is found between the microwave dielectric losses and the width of first order phonon lines in a sequence of BMT → SAT → SAN ceramics with increasing phonon damping. Moreover, the phonon damping decreases in materials with non-close-packed structure where there is enough space for undisturbed phonon vibrations. The problem of charge compensation in compounds with the Bsite disorder is also discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 511: Symposium E – Low Dielectric Constant Materials IV , 1998 , 165
Copyright
Copyright © Materials Research Society 1998

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