✍ Scribed by U. Eibenstein; W. Jung
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Zn 11 Rh 18 B 8 and Zn 10 MRh 18 B 8 with M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Al, Si, Ge and Sn are obtained by reaction of the elemental components in sealed tantalum tubes at 1500 K. They crystallize tetragonally with Z = 2 in the spacegroup P4/mbm with lattice constants a = 1771.2(2) pm, c = 286.40(4) pm for Zn 11 Rh 18 B 8 and in the range a = 1767.65(9) pm, c = 285.96(3) pm (Zn 10 NiRh 18 B 8 ) to a = 1774.04(9) pm, c = 286.79(2) pm (Zn 10 SnRh 18 B 8 ) for the quaternary compounds. According to powder photographs all compounds are isotypic. Struture determinations based on single crystal X-ray data were performed with Zn 11 Rh 18 B 8 , Zn 10 FeRh 18 B 8 and Zn 10 NiRh 18 B 8 . The structure of Zn 11 Rh 18 B 8 is related to the Ti 3 Co 5 B 2 type. Along
the short axis planar nets of rhodium atoms composed of triangles, squares, pentagons and elongated hexagons alternate with layers containing the boron and zinc atoms. The rhodium atoms form trigonal prisms centered by boron atoms, two kinds of tetragonal and pentagonal prisms centered by zinc atoms and elongated hexagonal prisms containing pairs of zinc atoms. In the quaternary compounds Zn 10 MRh 18 B 8 the zinc atoms in one sort of tetragonal prisms are replaced by M atoms.
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