Transport and dielectric measurements have been performed in CaCu₃Ti₄O₁₂ ceramics. The bulk ac conductivity shows a power-law behavior at different temperatures, which is related to polaron relaxation. The temperature dependence of the bulk dc conductivity indicates a variable-range-hopping mechanism. The dielectric relaxation frequency deviates from the Arrhenius behavior. An equivalent circuit is used to explain qualitatively the experimental data of CaCu₃Ti₄O₁₂.
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Zhang et al. (2004) studied this question.
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