2932.     RUFF, O., AND KEILIG, F.  [Investigations at Higher Temperatures.  VIII.  Cobalt and Carbon.]  Ztschr. anorg. Chem., vol. 88, 1914, pp. 410-423; Chem. Abs., vol. 9, 1915, p. 435.

        Addition of C to Co lowers the melting point to 1,300° at 2.4% C; with increasing temperature the solubility of C in the melt increases, first slowly with increasing temperature, then more rapidly; at 2,100° and at 6.36% C and at about the composition of the compound Co₃C the solubility curve has an upward inflexion similar to, but not as marked as, that with Ni; the solubility of C then rises to 7.4% at 2,415°.  The authors concluded that Co₃C had been formed, but on examination found only graphite, and, therefore, assumed that the Co₃C, if formed, had very quickly decomposed.