Interaction energy E(C-C) between nearest neighbour C atoms and E(C-M) between a C atom and M atom in hypostoichiometric monocarbide MCx (M = Ti or Nb) were evaluated from the available a(C)-T-x relationships by statistical thermodynamic analysis (a(C): carbon activity, T: temperature, x: C/M atom ratio). Estimated E(C-C) values were positive (i.e. the C-C interaction is repulsive) for both TiCx and NbCx and E(C-C) varied with T showing a trend of weakening repulsion with rising T. On the other hand, the C-M interaction appeared to be strongly attractive.
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