Dense Bi ( Fe 1/2 Cr 1/2) O 3 ceramics with R3c crystal structure were synthesized by solid-state reaction under high pressure. Transmission electron microscope observations revealed an incommensurable superstructure along 〈110〉 direction. Magnetization measurements indicated a transition to a cooperative magnetic state below ~130 K. Dielectric properties of Bi ( Fe 1/2 Cr 1/2) O 3 showed a dielectric constant anomaly located at ~140 K indicating the giant dielectric relaxation in multiferroic Bi ( Fe 1/2 Cr 1/2) O 3 compound, which can be explained by the enhanced conductivity and possible Maxwell–Wagner contribution. Large dielectric frequency dispersion was observed at 140–185 K, and was supposed to be a thermal activated intrinsic process.
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Zhu et al. (2013) studied this question.
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