Electrical and dielectric properties of xNi0.53Cu0.12Zn0.35Fe1.88O4 + (1−x) BaTiO3 nanocomposites

The composite of xNi0.53Cu0.12Zn0.35Fe1.88O4+ (1-x)BaTiO3were prepared by mixing nanocrystalline Ni0.53Cu0.12Zn0.35Fe1.88O4and BaTiO3powders at different weight percent.The powders were densified using microwave sintering method at 900°C/30 min. The phase and morphology' of the composites was observed with X-ray diffraction (XRD) and Scanning Electron Microscope (SEM). The frequency dependence of real (ε') and imaginary (ε") parts of permittivity was measured in the range of lMHz-1.8GHz. The values of ε' increases with an increase of BaTiO3content at 1MHz. The experimental value of dielectric constant was compared with available theoretical models. The transition temperature (Tc) of composite materials decreases with an increase of BaTiO3content.