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The frequency dependence of the complex dielectric constant (DC) of Pb(TixZr1-x)O3 ceramics (x=0.4; 0.48; 0.6) was measured between 10 Hz and 1010 Hz. Only one dispersion region was found with the relaxation frequency being independent of x. The spectral shape function for PZT 0.4, which is independent of the temperature between - 123°C and +239°C, corresponds to the many-body universal response described by Jonscher, Dissado and Hill. Our results scarcely corroborate the common idea of domain-wall and phase boundary contributions to the DC.
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Kersten et al. (1986) studied this question.
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