The dielectric properties of CaCu3Ti4O12 (CCTO) ceramics have been investigated in a temperature range of 143–573K and a frequency range of 1Hz–10MHz. A dielectric anomaly has been observed between 350 and 600K. The broad dielectric peaks in ε′(T) can be well fitted by a modified Curie-Weiss law and a Vogel-Fulcher relationship, which is indicative of a relaxor ferroelectric behavior. A slim I-V loop as well as the P-E hysteresis loop and broad maxima in ε″(f) also suggest the existence of a relaxor ferroelectric behavior in CCTO ceramics.
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Ke et al. (2006) studied this question.
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