AC conductivity, density related and magnetic properties of Ni1-xZnxFe2O4 ferrites with the variation of zinc concentration

AC conductivity, density related and magnetic properties are reported for Ni1-xZnxFe2O4 ferrites with the variation of zinc concentration prepared by the standard solid state reaction technique. X-ray powder diffraction patterns confirmed the spinel structure of the prepared compounds. AC conductivity (In sigma(ac)) increases from - 10.045 (S/m) to -3.781 (S/m) with the increase in zinc concentration from 0.0 to 1.0 at the frequency of 1 kHz. Lattice parameters, sintered density and grain size increase whereas X-ray density and porosity decrease with the increase in zinc concentration. Saturation magnetization increases with the increase in zinc concentration up to x=0.4 and after that it decreases with the increase in zinc concentration. Remanence magnetization and magnetic moment almost have the similar trend as that of saturation magnetization. Yafet-Kittel angles increase with the increase in zinc concentration. The possible reasons responsible for these changes are undertaken. (C) 2007 Elsevier B.V. All rights reserved.