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P. Hu, H. Yang, D. Pan, H. Wang, J. Tian, S. Zhang, X. Wang and A. A. Volinsky, “Heat Treatment Effects on Microstructure and Magnetic Properties of Mn-Zn Ferrite Powders,” Journal of Magnetism and Magnetic Materials, Vol. 322, No. 1, 2010, pp. 173-177. |doi:10.1016/j.jmmm.2009.09.002

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• TITLE: Low-Temperature Synthesis of Nanocrystalline Mn0.2Ni0.8Fe2O4 by Oxalate Precursor Route

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

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

  JOURNAL NAME: Advances in Materials Physics and Chemistry, Vol.3 No.1A, April 26, 2013

  ABSTRACT: Manganese nickel ferrite (Mn0.2Ni0.8Fe2O4) 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 Mn0.2Ni0.8Fe2O4 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 Mn0.2Ni0.8Fe2O4 phase at annealing temperature 1100℃.