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Return to Abstracts of Literature 1500-1749
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°.