Dependence of the resistivity of nonstoichiometric titanium carbide TiCy on the density and distribution of carbon vacancies

Abstract

The influence of temperature and of the density and distribution of structural vacancies in the carbon sublattice on the resistivity of nonstoichiometric titanium carbide TiCy(0.5⩽y⩽0.98) is studied. It is shown that in titanium carbide TiCy with y<0.7 reversible disorder-order structural phase transitions occur at temperatures below 1000 K. The temperatures of order-disorder phase transformations are determined. The dependence of the residual resistivity on the composition of the disordered titanium carbide is explained by the change in the carrier density in the region of homogeneity of the carbide TiCy, on the one hand, and the atom-vacancy interaction, on the other.