Abstract
The structure and magnetic properties of TlCr X 2 ( X= S, Se, Te), Tl 3CrS 3, Tl 3Cr 3S 5, TlCr 3S 5, TlCl 5S 8 and AgCrO 2 have been investigated. TlCrS 2, TlCrSe 2 and Tl 3CrS 3 order ferromagnetically with Curie temperatures in the range 60–140 K. The other compounds are antiferromagnetics with negative paramagnetic Curie temperatures, whereas TlCrTe 2 is antiferromagnetic with a positive paramagnetic Curie temperature. In the case of the layered hexagonal TlCrS 2 and TlCrSe 2 owing to the great radius of the Tl-ion and the large Cr-Cr-distance the intralayer exchange interaction is positive giving rise to the ferromagnetic order. For AgCrO 2 the smaller intralayer Cr-Cr-distance gives rise to negative exchange interaction and antiferromagnetism.
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