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Return to Abstracts of Literature 1750-1999

Literature Abstracts

 1935.    KOHLHAAS, R., AND MEYER, W. F.  [Formation, Stability and Structure of Nickel Carbide.]  Metallwirtschaft, vol. 17, 1938, pp. 786-790; Chem. Abs., vol. 32, 1938, p. 7870.

       Addition of C to Co-free Ni, in the form of powder or wire from benzene vapor, water gas, or illuminating gas at temperatures ranging 230°-730° shows that only Ni₃C is observable, which is formed from 240° up to 530°-580°.  Tempering experiments in a vacuum show the Ni₃C formed above 420°-500° to be metastable.  The separation of C increases very much with increasing temperature; probably it is due to the diffusion equilibrium of the gases used and their decomposition products.  X-ray pictures show that Ni₃C can have no hexagonal symmetry but that a rhombic structure of the compound and hence its isomorphy with Fe₃C and Co₂C is very likely.