Influence of Processing Parameters on the Magnetic Properties of Mn-Zn Ferrites
- 1 ME Lab., Phys. Dept., Faculty of Science, Al-Azhar Univ., Nasr City, Cairo, Egypt.
Abstract
Pure MnO 2 , ZnO and Fe 2 O 3 were used to prepare a Mn-Zn Ferrite sample of the nominal composition Mn 0.64 Zn 0.29 Fe 2.07 O 4 . 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 Fe 2 O 3 and MnO 2 ) shifted to higher 2? angles, suggesting that Zn 2+ cations had diffused through Fe 3+ and/or Mn 4+ 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 MnO 2 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).
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