Preparation and Characterization of Cobalt Magnesium Nano Ferrites Using Auto-Combustion Method

Abstract

Co0.6Mg0.4 Fe2O4 samples are prepared by auto-combustion method at various pH values of the solutions (sols). The precursors for the solids are different gels obtained from metal nitrates and citric acid by sol-gel process. The pH is varied by adding ammonia. The gels thus obtained are heated at 2000C and they exhibited self propagating combustion behavior. The residues are heated for one and half hours at 6000C. XRD analysis of the final solids revealed that after combustion the gel is directly transformed into nano sized cobalt magnesium ferrite particles. The samples are sintered at 6000C and higher temperatures. However, the samples sintered at 6000C have shown single phase nano particles. The ferrites formed have shown variation in particle size for varying pH values. FTIR of the samples supported the Octahedral and Tetrahedral site absorption values. The DC conductivity of the above samples has been studied and the results are discussed.