Low-Temperature Synthesis of Nanocrystalline Mn_0.2Ni_0.8Fe2O₄ by Oxalate Precursor Route

Mahmoud M. Hessien, Zaki I. Zaki, Al-Qahtani Mohsen

Department of Chemistry, Faculty of Science, Taif University, Taif, KSA.

DOI: 10.4236/ampc.2013.31A001                

Abstract

Manganese nickel ferrite (Mn_0.2Ni_0.8Fe₂O₄) powder was synthesized through oxalate precursor route. The effect of annealing temperature (400℃ - 1100℃) on the formation, crystalline size, morphology and magnetic properties was systematically studied. The resultant powders were investigated by thermal analyzer (TG-DTG-DSC), X-ray diffractometer (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). Based on thermal analysis results, the oxalate mixture decomposed thermally in multisteps weight loss up to about 680℃. XRD indicated that Mn_0.2Ni_0.8Fe₂O₄ formed at much lower annealing temperature (≤400℃) but contained α-Fe₂O₃ impurity. The hematite phase decreased by increasing the annealing temperature. The lattice parameters were increased with increasing annealing temperature up to 1000℃. The average crystalline size increased by increasing the annealing temperature. Single well crystalline ferrite was obtained at 800℃with crystallite size about 109 nm. The saturation magnetization of the ferrites powders continuously increased with the increase in annealing temperature. Maximum saturation magnetization 48.2 emu/g was achieved for the formed Mn_0.2Ni_0.8Fe₂O₄ phase at annealing temperature 1100℃.

Keywords

Ni-Mn Ferrite; Crystal Structure; Soft Magnets; Oxalate Precursor Route; Magnetic Properties

Conflicts of Interest

The authors declare no conflicts of interest.

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