ISSN 0004-881X

Low Temperature Synthesis of MgFe₂O₄ Soft Ferrite Nanocrystallites

by A. A. Thant^1*, S. Srimala¹, P. Kaung², M. Itoh³, O. Radzali¹ and M. N. Ahmad Fauzi^1*

1)School of Materials & Mineral Resources Engineering, Universiti Sains Malaysia, Engineering Campus, 14300, Nibong Tebal, Pulau Pinang, Malaysia
2)Physics Department, University of Yangon, Kamayut, Yangon, Myanmar
3)Materials and Structures Laboratory, Tokyo Institute of Technology, 4259, Nagatsuta, Midori, Yokohama, 226-8503, Japan

Abstract

Single phase soft ferrite nanocrystallites could be synthesized by various methods. Most of the methods start from preparation of powder or they are high temperature synthesis. We have tried to synthesize MgFe₂O₄ nanocrystallites at low temperature to improve their properties. MgFe₂O₄ magnetic particles with crystallite size (~ 7.4nm) were successfully synthesized below 200€C by auto- combustion assisted sol-gel method with the control of pH value and hydrolysis conditions. The pH dependent combustion nature has been studied by thermal analysis (DTA and TG) of the dried gel. The formation of single phase cubic spinel was confirmed by XRD analysis. The morphology of the powder was characterized by FESEM. It represents a soft agglomerated structure composed of magnetically interacting ultrafine crystallites. These nanocrystallites synthesized at low temperature improved electrical and magnetic properties and the results discussed.

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