Synthesis of barium hexaferrite nano-particles via mechano-combustion route

The XRD results indicate the presence of γ-Fe2O3 as a major phase and BaCO3 as a minor phase in as-burnt powder. Analysis of the XRD patterns also confirms the transformation of γ- to α-Fe2O3 via mechanical milling; the rate of this transformation is strongly affected by milling conditions. Barium hexaferrite starts to form at 700 °C and fully formed at 1000 °C for milled sample under the optimum milling conditions. XRD and DTA/TGA results showed that an intermediate precursor milling accelerates the formation of magnetic phase. SEM micrograph of the sample milled for 120 h and then annealed at 1000 °C exhibited nano-size particles of BaFe12O19 with mean particle size of around 100 nm.