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Problem statement: This study involved an investigation to ascertain the diffusion of NiO and ZnO into the tetrahedral and octahedral sites using mechanical alloying method. The effect of mechanical alloying towards particle size was also reported. Approach: NiO, ZnO and Fe 2 O 3 precursors were mechanically alloyed to synthesis ultrafine powders of Ni 0.5 Zn 0.5 Fe 2 O 4 . Various milling times were employed to study the effect of milling time on the materials. The ultrafine powder was sampleddoi:10.3844/ajassp.2009.1548.1552 fatcat:dlz3ocezk5gudihah267qwvbzq