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Synthesis and Magnetic study of Zirconium–Cobalt Substituted Calcium Hexaferrites

The Zirconium – Cobalt substituted ferrite ceramics with chemical composition Ca(Zr-Co)4Fe8O19 and Ca(ZrCo)8Fe4O19 having magnetoplumbite structures were synthesized using perfect stoichiometric mixtures of nitrates by the novel method of synthesis ‘Microwave Induced Sol Gel Combustion Route’. XRD results show a single-phase formation of calcium hexaferrite. The lattice parameters ‘a’ , ‘c’ and (h k l) values confirms the formation of hexagonal unit cell. Response to the external applied magnetic field is studied using vibrating sample magnetometer (VSM), which shows the moderate values of coercivity, saturation and remnant magnetization. The saturation magnetization (Ms), Remenace (Mr) and Coercivity (Hc) found to decrease with increase in the value of substitution which is attributed to occupation of sub lattice spin-up and spin-down sites by diamagnetic ions and magneto crystalline anisotropy. The variation in magnetic parameters give rise to the possibility of controlling magnetic properties by varying the degree of substitution.