Phase Relation of Nonstoichiometric Chromium Sulfide CrSx in the Range of \(1.200{\lesssim}x{\lesssim}1.480\)

Abstract

Composition analysis and vapor pressure measurement on the chromium sulfides prepared under the controlled pressures and temperatures indicated that the equilibrium sulfur pressure for the CrS x increases monotonically with the increasing sulfur content in both ranges of 1.200< x <1.390 and 1.420< x <1.480 and is kept constant in the range of 1.390< x <1.420 corresponding to the coexistence of two crystalline phases. The existence of two crystalline phases with 1.420< x <1.463 and 1.463< x <1.480 was estimated from the abrupt change in the heat of vaporization of sulfur in the CrS x at x ≈1.463. The hexagonal unit cell dimension of the superstructure for x =1.200 is expressed in terms of \(\sqrt{3}\) a and 2 c . Fox x =1.333, monoclinic deformation is observed. The magnetic susceptibility of single crystals with the various controlled compositions was measured.