(1 -x)BaTiO 3 -xBiYO 3 [(1 -x)BT-xBY] polycrystalline ceramics were prepared by solid-state reaction method. The ceramics are in tetragonal phase when x ≤ 0.04, transform to pseudocubic at x ≥ 0.06, showing a classic ferroelectric to relaxor transition at x = 0.06, where the phase transition temperature was found to shift to higher temperature with increasing frequency. The dielectric permittivity peaks were analyzed by the modified Curie-Weiss law. Both parameters DT diffuse and DT relaxor were found to increase with increasing BY content, demonstrating a stronger relaxor characteristic.

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