Effect of nonstoichiometry and ordering on the period of the basis structure of cubic titanium carbide

We have examined the influence of nonstoichiometry and order-disorder phase transformations on the basis period (of type B1) of the structure of titanium carbide TiC_y (0.5<y<1.0). We found that ordering of titanium carbide TiC_y with formation of superstructures of the type Ti Ti₂C and Ti₃C₂ leads to growth of the period of the basis crystal lattice in comparison with the disordered carbide. Taking the change in the lattice period into account, we discuss the question of the directions of the static displacements of atoms near a vacancy. Fiz. Tverd. Tela (St. Petersburg) 41, 1134–1141 (July 1999)