Dielectric and magneto-electric behavior of (x) Co0.8Mn0.2Fe2O4 and (1-x) PbZr0.52Ti0.48O3 composites

The multiferroics with ferroelectric (FE) and ferromagnetic (FM) phases (x) [Co0.8Mn0.2Fe2O4] + (1-x) [PbZr0.52Ti0.48O3] composite samples with x = 0.25, 0.50 and 0.75, were prepared by ceramic route. X-ray diffraction (XRD) patterns of as-prepared samples exhibit the presence of lead zirconate titanate PbZr0.52Ti0.48O3 (PZT) and Co0.8Mn0.2Fe2O4 (CMFO) phases in the PZT-CMFO composites. The values of grain size were found to be decreased in the range of 680-390 nm with increasing the ferrite contents from x = 0.25 to 0.75. The temperature dependent dc resistivity (rho) of the composites was reduced with increasing x contents. The values of dielectric constant (epsilon ') 7x103-20 x103 were found to be increased at 30 Hz frequency. The variations in (epsilon ') with frequency (20 Hz -1MHz) were caused by interfacial polarization occurred in the composites. The changes in AC conductivity (sigma ac) of composite samples were found to be increased with the frequency. The higher value of magneto-electric (ME) coefficient (0.641 mu v/cm Oe) was obtained for x = 0.25 of composite sample.