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High frequency dielectric relaxation in Pb(Sc1/2Ta1/2)O3 ceramics

โœ Scribed by F. Chu; N. Setter; C. Elissalde; J. Ravez

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
406 KB
Volume
38
Category
Article
ISSN
0921-5107

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โœฆ Synopsis

Pb(Sc~ ~Tal _,)O~ ceramics have been characterized by dielectric measurements in a wide range of frequencies (10 2-10'; Hz). A strong dispersion occurs with two low and high frequency contributions below the transition temperature. Only high frequency relaxation is still observed at high temperature. A microscopic model of correlated chains was used in order to explain the latter relaxation. Dipole correlations at low temperature are responsible for the low frequency dispersion. A minimum in the high frequency relaxation appears at the transition temperature. Identical results have been observed for a Pb(Sc~ _,Nb, ~)O~ ceramic.

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