Effect of nickel on the electrical properties of nanostructured MnZn ferrite

Nano-particles of Mn0.5−xNixZn0.5Fe2O4 (x = 0.0, 0.1, 0.2, 0.3 and 0.5) have been synthesized by chemical co-precipitation method. The lattice constant (Å) for all Mn/Ni concentration is found to be less than that for the corresponding bulk values. The X-ray intensity of the (4 4 0) plane increases with increasing Ni2+ concentration indicating the occupation of Ni2+ ions on octahedral sites. The dielectric constant decreases with the increase in Ni concentration except for x = 0.3. Relaxation peaks were observed for all the samples in tan δ versus frequency curves and the relaxation peaks shift towards lower frequency for higher nickel concentration. The resistivity was found to increase with increase in Ni concentration and decreases with increase in temperature.