Abstract
The structural parameters of chromium sulfide selenides are intermediate between those of the sulfides and the selenides. The nature of the dependence of the magnetic properties of the sulfide selenides on temperature and composition has much in common with that for the sulfides. The presence of selenium atoms in the sulfide lattice leads merely to some distortion of the anomalies which are observed for the pure sulfides. In the mixed chalcogenides of chromium, gradual oxidation of the monosulfide by selenium takes place, with the conversion of Cr(II) into Cr(III). The principal contribution to the magnetic moments is made by the spin values, equal to 4.9 μB for Cr(II) and 3.87 μB for Cr(III). The slight increase in the lattice parameters of the sulfide selenides (increase in the Cr−Cr distances) compared with the sulfides leads to a decrease in the exchange interactions in the sulfide selenides compared with the sulfides. This is indicated by the change in the paramagnetic Curie temperature θ with change in composition.
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