of quenching on structural and magnetic properties of Ni0.5-X ZnX Cu0.5 Fe2O4 mixed ferrites prepared using solid state route

A system of Ferrites with formula Ni0.5-x Znx Cu0.5 Fe2O4 (x=0.0,0.1,0.2,0.3,0.4,0.5) synthesized through solid state route. During the second sintering the material is quenched from 1137 K to 77 K by dropping it in liquid nitrogen bath. The solid material is ground in agate pestle, mortar and made as powder. The powder form of ferrite is subjected to structural studies using XRD, thermal, FTIR and Raman measurements.XRD patterns present that the crystals formed are in the polycrystalline nature. The structure of ferrite is confirmed as Face Centred Cubic (FCC) phase. The particle size of the ferrite system varies from 262 to 427 Å and they are bulk particles. Thermal study helps to infer completion of reaction of formation of ferrite. FTIR and Raman spectroscopy measurements confirm the presence of tetrahedral and octahedral coordination of atoms in spinel structure of ferrite. However a dominating impact of defect states intruded in the structure of ferrite is visualized through FTIR and Raman spectra. The presence of defect states is attributed to mainly to the quenching of the ferrite by a large range of temperature. The existence of defect states will contribute a big variation in electrical and the magnetic properties.