High frequency dielectric relaxation in Pb(Mg/sub 0.317/Nb/sub 0.633/Ti/sub 0.05/)O/sub 3/ ceramics

Dielectric measurements have been performed on Pb(Mg/sub 0.317/Nb/sub 0.633/Ti/sub 0.05/)O/sub 3/ ceramics in the frequency and temperature ranges 10/sup 6/-10/sup 9/ Hz and 110-400 K, respectively. A dielectric relaxation of the Cole-Cole type has been found between 10/sup 7/ and 10/sup 9/ Hz, depending on the temperature. This relaxation exists not only in the ferroelectric phase but also in the paraelectric one. A minimum of the relaxation frequency occurs at temperatures close to the Curie temperature.<
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