The title compounds have been prepared and their structures determined. Na 2 AgAs crystallizes in the Na 2 CuAs structure type, forming infinite Ag-As-zig-zag-chains. KCuS builds up a new structure type but with similar zig-zag-chains of Cu- and S-atoms. Crystallographic data: Na 2 AgAs: C222 1 , a= 879 ± 2 pm, 6 = 736 ± 2 pm, c = 559 ± 2 pm; KCuS: Pna2 1 , a = 1066 ± 2 pm, 6 = 620 ± 2 pm, c = 532 ± 2 pm.
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Savelsberg et al. (1978) studied this question.