0.5BiDyxFe1–xO3-0.5PbTiO3(0.5BDxF1–x-0.5PT) (x=0.00, 0.05, 0.10, 0.15, 0.20) multiferroic composites were pre-pared by conventional solid state reaction method. Structural characterization was performed by X-ray diffraction and the mate-rials showed tetragonal structure at room temperature. Surface morphology of the composites was studied by a scanning electron microscope (SEM). Frequency and temperature dependence of dielectric constant(εr)and dielectric loss (tanδ) of 0.5BDxF1–x- 0.5PT were measured in a wide range of frequency (100 Hz to 1 MHz) and temperature (25 to 400 oC). The analysis of the study showed that theεr and tanδdecreased with increasing frequency in the given range for all the samples which could be explained through the occurrence of dipole relaxation process. The effect of substitution of rare earth element dysprosium (Dy) showed increase inεrin all the samples prepared for different concentrations from 0.00 to 0.20. An explanation for high value ofεr for Dy modified 0.5BiFeO3-0.5PbTiO3 (0.5BF-0.5PT) compared to Gd modified 0.5BF-0.5PT was provided. The variation of AC conductivity with inverse temperature found to obey the Arrhenius equation and the composites showed negative temperature coefficient of resistance (NTCR) behavior. The activation energy was found to be in the range from 0.25 to 0.40 eV for all the studied samples.
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