The crystal structure of β-NaSn (low temperature modification) has been determined. It crystallizes tetragonally, a= 1046 ± 2, c = 1739 ± 3 pm, isotypic with NaPb. The short distance between Sn-atoms of different Sn4-groups is discussed.

Abstract The new compounds BaBiSe3 and BaSbTe3 crystallize in the orthorhombic system, space group P212121 with BaBiSe3: a = 1724 ± 2 pm, b = 1600 ± 2 pm, c = 437.0 ± 0.5 pm; BaSbTe3: a = 1809 ± 2 pm, b = 1694 ± 2 pm, c = 463.5 ± 0.4 pm. BiSe6- or SbTe6- octahedra, resp., are connected by common edges to fourfold strings. These are bound by additional chalcogen atoms to sheets, between which the Ba ions are located.

Abstract NH4SbS2 has been prepared and its crystal structure determined. The new compound crystallizes triclinic, space group P1̄, with the following cell-constants: a = 1213 pm, b = 641.9 pm, c = 634.0 pm, a = 102.9°, β = 98.9°, γ = 101.2°. In the structure there are ψ-SbS4-trigonal bipyramids connected to chains by common edges.

Abstract β-NaSbS2 crystallizes monoclinically, C2/m, with a = 1284(2) pm, b = 582.5(8) pm, c = 581.3(3) pm, β - 118.74(7)°. In the structure there are ψ-SbS5-octahedra, which are connected by common edges to sheets separated by the Na ions.

Abstract The crystal structures of Na9Sn4 and Na15Sn4 have been determined. Na9Sn4 crystallizes orthorhombic, a=542 ±1, b = 939 ±2, c = 2962 ± 6 pm, isotypic with LigGe4. Na15Sn4 crystallizes cubic, a = 1314 ± 2 pm, isotypic with Na15Pb4 (Cu15Si4-type). The structural relationship of Na9Sn4 to the variants of the W-Structure type is shown.