Experimental Study of the Solid SolutionsTixTa1−xS2

Abstract

We have found that the substitutional replacement of Ti for Ta in Ta${\mathrm{S}}_2$ stabilizes the octahedral $1T$ phase for $x$ between 0.1 and 0.9. A comparison of the resistivity, magnetic susceptibility, and thermoelectric power shows that at room temperature the properties vary systematically from diamagnetic, semiconducting behavior for $1T-\mathrm{T}\mathrm{a}{\mathrm{S}}_2$ to paramagnetic, metallic behavior for Ti${\mathrm{S}}_2$. This interpretation of the data contradicts all previous models which treat Ti${\mathrm{S}}_2$ as a degenerate semiconductor.