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Aus der DTA und Röntgenbeugungsuntersuchungen wird das Phasendiagramm La2Se3‐Cu2Se konstruiert.

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Abstract. CuLaS2, monoclinic, P2Jb, a = 6.646 (2), b = 6.938 (2), c = 7.325 (2)A, ~= 98.73 (2)°, Z = 4, d m = 5.29 (8), d x = 5.3 Mg m -3. The structure has been solved by direct methods and refined by leastsquares methods to a final R value of 0.063 for 999 reflexions. The structure is built up of sheets parallel to the b and c axes. One sheet is made of (LaaS) tetrahedra, and has the composition (LaS); the second sheet is formed by (CuS4) tetrahedra arranged in pairs, which alternate with pairs of empty tetrahedra.

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