Structural, Electrical and Dielectric Properties of Nanocrystalline Mg-Zn Ferrites

The nanocrystalline Mg-Zn ferrites having general formula Mg1-xZnxFe2O4 (x=0, 0.1, 0.2, 0.3, 0.4, 0. 5) were prepared by WOWS sol-gel route. All prepared samples were sintered at 700 degrees C for 2 h. X-ray powder diffraction (XRD) technique was used to investigate structural properties of the samples. The crystal structure was found to be spinet. The crystallite size, lattice parameters and porosity of samples were calculated by XRD data analysis as function of zinc concentration. The crystallite size for each sample was calculated using the Scherrer formula considering the most intense (3 I 1) peak and the range obtained was 34-68 nm. The dielectric constant (epsilon), dielectric loss tangent (tan delta) and AC electrical conductivity of nanocrystalline Mg-Zn ferrites are investigated as a function of frequency. The dielectric constant (epsilon), dielectric loss tangent (tan delta) increased with increase of Zn concentration. All the electrical properties are explained in accordance with Maxwell-Wagner model and Koops phenomenological theory.