1446. ---------------. [HOFER, L. J. E., COHN, E. M., AND PEEBLES, W. C.] Modifications of the Carbide, Fe2C – Their Properties and Identification. Jour. Am. Chem. Soc., vol. 71, 1949, pp. 189-195; Chem. Abs., vol. 43, 1949, p. 3699.

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Literature Abstracts

1446. ---------------. [HOFER, L. J. E., COHN, E. M., AND PEEBLES, W. C.] Modifications of the Carbide, Fe₂C – Their Properties and Identification. Jour. Am. Chem. Soc., vol. 71, 1949, pp. 189-195; Chem. Abs., vol. 43, 1949, p. 3699.

Purpose of this paper is to determine the relationship between the Fe₂C carbides that were reported in thermomagnetic studies and those reported in X-ray diffraction studies. The existence of 2 carbides of Fe with formula Fe₂C and having Curie points at 247° and 380° has been confirmed. A hexagonal close-packed carbide of Fe has been prepared. This carbide has properties similar to those of the carbide described by Halle and Herbst. The identity of the 380° Curie-point carbide of Pichler and Merkel with the hexagonal carbide has been established. The identity of the 247° (265° according to Pichler and Merkel) Curie-point carbide with the Hägg carbide has been established. The carbides reported by Hofmann and Groll and by Tutiya seem to be the hexagonal carbide. The hexagonal carbide decomposes above about 300° to Hägg carbide, which in turn decomposes at about 550° in 1 hr. to cementite and free C.