Fabrication of nano-sized Ba xMg 1− xFe 2O 4 ferrite powders by using self-propagating high temperature synthesis reaction and mechanical milling

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Nano-sized Ba x Mg 1− x Fe 2O 4 ferrite particles less than about 150 nm were prepared by using self-propagating high temperature synthesis (SHS) and mechanical ball milling. As the ratio of BaO 2 to MgO in the initial powder composition varied from 0.25 to 4.0, coercive force (iHc) decreased about 102%, whereas, maximum magnetization (Ms) and residual magnetization (Mr) increased about 324% and 221%, respectively. Oxygen pressure changes from 0.25 to 1.0 MPa during SHS reaction resulted in decreasing iHc about 46%, whereas, increasing Ms and Mr about 59% and 4%, respectively. An empirical equation to describe the SHS reaction with oxygen pressure was obtained.