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Structural and Magnetic Properties study of CoFe2O4 Nanopowder prepared by Mechanical Milling using metallic Cobalt and Hematite powder Blend

A. Beitollahi, R. Sani, Yu.V. Maksimov and I.P. Suzdalev
Iran University of Science and Technology (IUST), IR

Keywords:
nanopowder, cobalt ferrite, mechanical activation

Abstract:
In this work we report the phase formation and magnetic properties of CoFe2O4 nanopowder prepared by mechanical alloying technique using metallic cobalt and hematite powder (1:1 molar ratio) as the initial raw material in ambient air atmosphere. The formation of single phase cobalt ferrite of (Co2+ 0.18Fe3+ 0.82)[Co2+ 0.82 Fe3+ 1.18]O4 stoichiometry was confirmed for the samples milled above 15 hours without any heat-treatment by XRD and Mössbauer techniques. The average crystallite size of the sample milled for 30 h was ~ 13 nm. The highest room temperature value of the saturation magnetization (51 e.m.u./g) was obtained for the sample milled for 25h which was much lower than the corresponding value of the bulk cobalt ferrite due to the size effect.

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