THE MULTIFERROIC PROPERTIES OF Bi(Fe1/2Cr1/2)O-3 COMPOUND

Dense Bi(Fe1/2Cr1/2)O-3 ceramics with R 3c crystal structure were synthesized by solid-state reaction under high pressure. Transmission electron microscope observations revealed an incommensurable superstructure along direction. Magnetization measurements indicated a transition to a cooperative magnetic state below similar to 130 K. Dielectric properties of Bi(Fe1/2Cr1/2)O-3 showed a dielectric constant anomaly located at similar to 140 K indicating the giant dielectric relaxation in multiferroic Bi(Fe1/2Cr1/2)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.