1596. ---------------. [JACK, K. H.] Binary and Ternary Interstitial Alloys. I. Iron-Nitrogen System: The Structures of Fe4N and Fe2N. Proc. Roy. Soc. (London), vol. 195, A, 1948, pp. 34-40; Chem. Abs., vol. 43, 1949, p. 3765.

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Literature Abstracts

1596. ----------------. [JACK, K. H.] Binary and Ternary Interstitial Alloys. I. Iron-Nitrogen System: The Structures of Fe₄N and Fe₂N. Proc. Roy. Soc. (London), vol. 195, A, 1948, pp. 34-40; Chem. Abs., vol. 43, 1949, p. 3765.

ξ-Fe₂N phase is prepared by passing NH₃ over Fe at temperatures not exceeding 450°. The positions of N in γ (Fe₄N) and in ξ-phases are determined. Both are fully ordered interstitial alloys. In ξ the Fe atoms are in approximately hexagonal close-packed array. In each layer plane of octahedral interstices one-half of their number is occupied such that each N atom is allowed to have unoccupied holes above and below it in adjacent planes.