Magnetoelecric relaxors

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We have investigated magnetic and dielectric properties and related microstructures in (1-x)BiFeO_3-xBaTiO_3 solid solution using a transmission electron microscopy (TEM), in combination with conventional magnetic and dielectric measurements. Nano-sized domain structures in the cubic phase of (1-x)BiFeO_3-xBaTiO_3 with 0.33<x<0.60 were found. From high-resolution TEM observation, it is revealed that the cubic phase in 0.33<x<0.60 is characterized as nano-scaled coexisting state of the polar rhombohedral structure and the non-polar cubic one, which should be regarded as the psudo-cubic phase. On the other hand, both P-E hysteresis measurements and the TEM experiments revealed that the cubic phase without any distortion due to the coexisting state appears in the x=0.60 compound at room temperature. Our experimental findings suggested that (1-x)BiFeO_3-xBaTiO_3 is a good candidate materials showing a gigantic magnetoelectric effect as a magnetoelectric relaxor.