Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Structural and Magnetic Properties of Mechanochemically Prepared Li Ferrite Nanoparticles

  • Haddadi, M. (Department of Physics, Faculty of Science, University of Isfahan) ;
  • Mozaffari, M. (Department of Physics, Faculty of Science, University of Isfahan) ;
  • Amighian, J. (Department of Physics, Faculty of Science, University of Isfahan)
  • Received : 2016.12.10
  • Accepted : 2017.03.24
  • Published : 2017.06.30
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Abstract

In this work, lithium ferrite ($Li_{0.5}Fe_{2.5}O_4$) nanoparticles were prepared via mechanochemical processing and subsequent heat treatment at a relatively low ($600^{\circ}C$) calcining temperature. The raw materials used were high purity $Fe_2O_3$ and $Li_2CO_3$ that were milled for between 2 and 20 h. The milled powders were then calcined at temperatures of 500 and $600^{\circ}C$ for 5 h in air. XRD results show that optimum conditions to obtain single phase lithium ferrite nanoparticles with a mean crystallite size of about 23 nm, using Scherrer's formula, are 10 h milling and calcination at $600^{\circ}C$. Saturation magnetization and coercivity of the single phase Li ferrite nanoparticles are 44.6 emu/g and 100 Oe respectively, which are both smaller than those of the bulk Li ferrite. The Curie temperature of the single sample was determined by a Faraday balance, which is $578^{\circ}C$ and smaller than that of bulk Li ferrite.

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