Influence of Processing Parameters on the Magnetic Properties of Mn-Zn Ferrites

S. A. El-Badry

ME Lab., Phys. Dept., Faculty of Science, Al-Azhar Univ., Nasr City, Cairo, Egypt..

DOI: 10.4236/jmmce.2011.105029                

Abstract

Pure MnO₂, ZnO and Fe₂O₃ were used to prepare a Mn-Zn Ferrite sample of the nominal composition Mn_0.64Zn_0.29Fe_2.07O₄. These oxides were mixed firstly for 1hr, and then were milled for 20 and for 40 hrs. The as-mixed and the milled powders were examined by XRD and ME spectroscopy. The investigated samples were further mixed with PVA, granulated, cold pressed and sintered at different temperatures (1000, 1300 and 1400 oC) for 2 hrs and were then reinvestigated again. The magnetic properties of all samples before and after sintering were characterized using VSM at a field of 15 k Oe. When the powder oxides were milled for 20 hrs, detectable diffusion reaction was observed where the centers of all XRD peaks (due to Fe₂O₃ and MnO₂) shifted to higher 2? angles, suggesting that Zn²⁺ cations had diffused through Fe³⁺ and/or Mn⁴⁺ lattices. The observed increase in the width of the XRD peaks can be attributed to the refinement of the powders by milling. Milling of the powder for 40 hrs resulted in the formation of spinel phase of (Zn, Fe), but MnO₂ was disappeared probably due to the formation of amorphous structure. Sintering at 1000, 1300, and 1400 oC resulted in the formation of different spinel (Mn-Zn) ferrites. The ME measurements followed the gradual formation the manganese zinc ferrite until complete formation which observed in the sample that milled for 40 hrs followed by sintering at 1300 oC for two hrs. However, it can be concluded that, the processing conditions of such sample represent are the best conditions for obtaining a soft manganese zinc ferrite (single phase).

Keywords

Mn-Zn ferrite, Ferrites, Soft magnets, XRD, ME spectroscopy and Magnetic properties.

Conflicts of Interest

The authors declare no conflicts of interest.

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