Magnetism of α′-FeN alloys and α″-(Fe16N2) Fe nitrides

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Abstract

The α′-FeN phase was prepared by treating Fe powder with NH3H2 gas mixtures at a temperature of ≈ 665°C followed by a quench to cryogenic temperatures. Conversion of α to α′ to an extent exceeding 85% has been achieved. α″-FeN is produced by treatment of α′ for ≈ 1 to 2 h at 120–150°C. Bsat values obtained for α′- and α″-FeN are 23.5 and 26.6 kG, respectively. The latter corresponds to 2.9μBFe atom, a 34% enhancement over that of α-Fe.

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