The dielectric properties of CaCu3Ti4O12 were studied in the frequency range from 100Hzto100kHz at temperatures ranging from 23K to room temperature. The properties can be perfectly described by the so-called universal dielectric response, indicating that they are intimately related to the hopping conductivity caused by localized carriers. A deviation from the Arrhenius behavior in the lower frequency (temperature) region has been attributed to Anderson localization. These results strongly indicate that the relaxation in CaCu3Ti4O12 might be a dipolar-type relaxation associated with the hopping localized carriers.
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Wang et al. (2007) studied this question.
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