Abstract
AbstractPreparation of Ni‐Mg‐Zn‐Co ferrites having general formula Ni0.5‐x Mgx‐0.01 Zn0.5‐y Coy+0.01 Fe2O4 (where x = 0.1, 0.2, 0.3, 0.4 and y = 0.1, 0.2, 0.3, 0.4) is carried out by conventional ceramic method. The X‐ray diffraction studies of compositions reveal the formation of single‐phase cubic spinel. The lattice parameter “a,” bond lengths RA, RB, and site radii rA, rB are found to increase linearly with increase in Zn content. The average grain diameter determined from scanning electron microscopy studies is found to increase with Ni content. The magnetic moment (μB) increases on addition of Zn. However, it decreases beyond Zn = 0.4. The lower values of hc and Mr/Ms show the existence of MD particles in the samples. The value of μB lie in the range of 0.85 to 1.09 and saturation magnetization (4πMs) varies between 834 and 1115 emu g‐1. It is observed that μB and Ms increase with Zn content upto Zn = 0.3 and then decrease. The cation distribution is proposed on the basis of site preference energies of the ions. Initial permeability increases slowly to the peak value at a certain temperature and drops abruptly to zero at the Curie temperature. The Curie temperature is found to decrease with increase in Zn content.
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