ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Using molecular beam epitaxy and ion implantation, Japanese workers have formed Fe16N2 in thin Fe films. They report a large magnetic induction for this nitride, ≥2.8 T. In the present study, Fe16N2 has been prepared in bulk form by treating Fe powder with NH3/H2 gas mixtures at temperatures in the range 660–670 °C. The γ phase alloy, which forms under these conditions, was quenched to room temperature to form the α'-Fe-N phase and then heat treated at 120–150 °C to form the α‘-Fe-N phase. The α' phase has been prepared in 80% purity, the other phase being nonmagnetic γ-Fe-N. The α‘ phase has been prepared in 50% purity, the impurity phases being α-Fe and γ-Fe-N. Magnetic measurements give saturation magnetizations at room temperature of 250±10 emu/g (2.6μB/Fe) for the α' phase, 285±10 emu/g (2.9μB/Fe) for the α‘ phase, and essentially zero for the γ phase. Mössbauer measurements confirm that nitrogen austenite is nonmagnetic. The anisotropy of Fe16N2 is small but detectable.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.356925
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