1598. ---------------. [JACK, K. H.] Binary and Ternary Interstitial Alloys. III. Iron-Carbon System: The Characterization of a New Iron Carbide. Proc. Roy. Soc. (London), vol. 195, A, 1948, pp. 56-61; Chem. Abs., vol. 43, 1949, p. 3765.

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Literature Abstracts

1598. --------------. [JACK, K. H.] Binary and Ternary Interstitial Alloys. III. Iron-Carbon System: The Characterization of a New Iron Carbide. Proc. Roy. Soc. (London), vol. 195, A, 1948, pp. 56-61; Chem. Abs., vol. 43, 1949, p. 3765.

Fe percarbide has a narrow range of composition and is identical with a carbide previously assumed to be an Fe₂C. The unit cell is either orthorhombic or hexagonal, the former having approximately 80 Fe atoms. An empirical formula Fe₂₀C₈ is proposed. Fe₂C has probably not yet been prepared. Cementite and the percarbide are both metastable. Fe percarbide decomposes giving cementite and C while cementite gives a

‑Fe and C. The rates of decomposition of the 2 carbides are negligible below 350°.