Dependence of phase configurations, microstructures and magnetic properties of iron nickel (Fe Ni) alloy nanoribbons on deoxidization temperature in hydrogen
Iron nickel (Fe Ni) alloy nanoribbons were reported for the first time by deoxidizing NiFe2O4 nanoribbons, which were synthesized through a handy route of electrospinning followed by air annealing at 450 degC, in hydrogen (H2) at different temperatures. It was demonstrated that the phase configurations, microstructures and magnetic properties of the as deoxidized samples closely depended upon the deoxidization temperature. The spinel NiFe2O4 ferrite of the precursor nanoribbons were firstly deoxidized into the body centered cubic (bcc) Fe Ni alloy and then transformed into the face centered cubic (fcc) Fe Ni alloy of the deoxidized samples with the temperature increasing. When the deoxidization temperature was in the range of 300 500 degC, although each sample possessed its respective morphology feature, all of them completely reserved the ribbon like structures. When it was further increased to 600 degC, the nanoribbons were evolved completely into the fcc Fe Ni alloy nanochains. Additionally, all samples exhibited typical ferromagnetism. The saturation magnetization (Ms) firstly increased, then decreased, and finally increased with increasing the deoxidization temperature, while the coercivity (Hc) decreased monotonously firstly and then basically stayed unchanged. The largest Ms ~145.7 emu*g 1) and the moderate Hc ~132 Oe) were obtained for the Fe Ni alloy nanoribbons with a mixed configuration of bcc and fcc phases.
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