Preparation and Structural Study of a New Ternary Gold Chromium Sulfide, AuCrS2

A new ternary chromium sulfide, AuCrS2, was prepared from a mixture of Au, Cr, and S powder. It crystallized in the trigonal space group R3m with a=3.4814(1) ? and c=21.451(8) ?. Single crystal study showed that AuCrS2 was a layered compound composed of CrS2 layers and Au ions which reside in the interlayer regions. It was also revealed that the structure of AuCrS2 was different from those of the other ACrS2-type layered compounds (A=Ag, Cu, Li, and Na) in the stacking sequence of CrS2 layers. Each Au atom is coordinated with two sulfide atoms. The magnetic susceptibility of AuCrS2 followed the Curie–Weiss law above 150 K, and it became antiferromagnetic with Néel temperature (TN) at 55 K.