743. ---------------.[DRAIN, J., AND MICHEL, A.] [Thermomagnetic and Structural Study of the Cobalt Carbide Co2C.] Bull. soc. chim., January-February 1951, p. 23.

743. ---------------. [DRAIN, J., AND MICHEL, A.] [Thermomagnetic and Structural Study of the Cobalt Carbide Co₂C.] Bull. Soc. Chim., January-February 1951, p. 23.

Reduced Co, supported on ThO₂, was carburized with CO at 210° C. to form paramagnetic, orthohombic Co₂C (abs. 1440) similar to Co₂N, with a=2.904Å, b=4.465Å, c=4.368Å. the crystalline parameters varied slightly with the mode of preparation, probably because of differences in composition. The carbide decomposed in vacuo at about 260° into a ferromagnetic hexagonal close-packed solid solution of C in a-Co, which was subsequently decarburized to hexagonal close-packed a-Co. Reaction set in at 298° in N₂, at 198° in H₂, and at 364° in CO.