ISSN 0004-881X

In-Situ Synthesis of Magnetic Mn-Zn Ferrite Ceramic Object by Solid State Reaction

by Emad M. M. Ewais, Mahmoud M. Hessien, Abdel-Hady A. El-Geassy

1 Refarctory & Ceramic materials Lab (RCML), Advanced Materials Dept., Central Metallurgical Research and development Institute (CMRDI), P. O. Box 87 Helwan, 11421 Cairo, Egypt
2 Electronic & Magnetic Lab, Advanced Materials Dept., Central Metallurgical Research and development Institute (CMRDI), P. O. Box 87 Helwan, 11421 Cairo, Egypt
3 Ironmaking Lab, Central Metallurgical Research and development Institute (CMRDI), P. O. Box 87 Helwan, 11421 Cairo, Egypt

Abstract

In-situ MnZn ferrite (Mn_0.8Zn_0.2Fe₂O₄) was synthesized by solid state reaction process. Stoichiometric amounts of high purity MnO₂, Zn_O and Fe₂O₃ were applied. The influence of temperature and reaction time on the rate of ferrite formation was studied. The thermal analysis tests of mixed oxides indicated that the reaction started up at 900-1000°C and completed at 1150°C which was followed up by X-ray phase analysis and confirmed by SEM and optical microscopic examination. The reaction products were characterized by measuring the bulk density, cold crushing strength and magnetic properties. It was observed that the reaction rate increased with temperature up to 1150°C then decreased with further rise in temperature up to 1200°C. The obtained results were rationalized based on the microstructure feature, porosity measurements and pore size analysis. Successful fabrication of dense MnZn ferrite which has high crushing strength and magnetic properties at 1150°C was processed.

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