Abstract
Soft magnetic Fe3O4/Ni3Fe composite powder has been synthetized, starting from Fe, Ni and Fe2O3 powders via mechanosynthesis and subsequent annealing. The incipient formation of Fe3O4 is noticed for the sample milled for 2 h. Formation of Ni3Fe and Fe3O4 does not occur completely after milling for 10 h and as a consequence the presence of a small amount of unreacted Fe2O3 can be found. Subsequent annealing led to the complete reaction between the precursors. Even for the un-milled homogenized mixture of precursors, a partial formation of Ni3Fe and Fe3O4 occurs during annealing. For the milled and annealed samples, the complete formation of the composite Fe3O4/Ni3Fe occurs after 6 h of milling. The DSC measurements and the XRD patterns of the samples subjected to DSC analysis revealed the formation of FeO phase for the starting sample and the samples milled short times (up to 1 h). The complete of the Fe3O4 is noticed upon increasing milling time. The first magnetization curves reveal a two-stage evolution for the milled samples. For milling times up to 3 h, when the Fe2O3 phase is still significant, the value of magnetization has tendency to decrease. Due to the progressive Fe3O4 and Ni3Fe formation, the value of magnetization increases for the samples milled for longer durations. The value of magnetization after annealing is larger than the magnetization value of the milled samples as a result of complete formation of ferrite phase.
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