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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.