The temperature dependence of the complex dielectric constant of Sr0.75Ba0.25Nb2O6 single crystals and of PLZT 8/65/35 ceramics is measured at frequencies between 10 and 1010 Hz. The results can be described by Cole-Cole circles. The distribution of relaxation times decreases with increasing temperature. The activation energies are 0.45 and 0.42 eV, respectively. These results corroborate the idea of two-level system-type disorder modes.
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Kersten et al. (1983) studied this question.
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