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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, Sn – New Ternary and Quaternary Zinc Rhodium Borides
Author(s) -
Eibenstein U.,
Jung W.
Publication year - 1998
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/(sici)1521-3749(199805)624:5<802::aid-zaac802>3.0.co;2-a
Subject(s) - rhodium , crystallography , tetragonal crystal system , zinc , ternary operation , crystal structure , boron , tantalum , materials science , lattice constant , chemistry , metallurgy , catalysis , diffraction , biochemistry , computer science , programming language , physics , organic chemistry , optics
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.