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 1308.    ---------------.  [HÄGG, G.] [Powder Photographs of a New Iron Carbide.]  Ztschr. Krist., vol. 89, 1934, pp. 92-94.  Chem. Abs., vol. 28, 1934, p. 7100.

       X-ray patterns of Fe that had been in contact with CO for 430 hr. at 225° show weak lines of Fe₃O₄ and Fe₃C, with stronger lines of a new carbide, which is probably Fe₂C.  At higher temperatures the Fe₃C grows at the expense of the Fe₂C.  After heating in vacuo at 500°, only lines of Fe₃C remain.  It was not found possible to index the lines of the pattern for Fe₂C.