Dielectric properties of xBaTiO 3 -(1-x)CoFe 2 O 4 composite materials have been investigated. Dielectric properties of BaTiO 3 , CoFe 2 O 4 and 0.5BaTiO 3 -0.5CoFe 2 O 4 samples show frequency dependence, which is classified as relaxor behavior with different relaxing degree. The relaxor behaviors were described using the modified Curier-Weiss and Vogel-Fulcher laws. Among three above samples, the BaTiO 3 sample has highest relaxing degree. Photoluminescence spectral indicated defects, which might in turn control relaxing degree.
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