High frequency dielectric relaxation in Pb(Sc1/2Ta1/2)O-3 ceramics
Pb(Sc1/2Ta1/2)O-3 ceramics have been characterized by dielectric measurements in a wide range of frequencies (10(2)-10(9) 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(Sc1/2Nb1/2)O-3 ceramic.
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Chu, F Ecole Polytech Fed Lausanne,Mx Ecublens,Lab Ceram,Ch-1015 Lausanne,Switzerland Cnrs,Inst Chim Matiere Condensee Bordeaux,F-33608 Pessac,France
Cited References Count:10
Record created on 2006-08-21, modified on 2016-08-08