Zn11Rh18B8 and Zn10MRh18B8 with M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Al, Si, Ge, Sn - New Ternary and Quaternary Zinc Rhodium Borides

Abstract

Zn11Rh18B8 and Zn10MRh18B8 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 Zn11Rh18B8 and in the range a = 1767.65(9) pm, c = 285.96(3) pm (Zn10NiRh18B8) to a = 1774.04(9) pm, c = 286.79(2) pm (Zn10SnRh18B8) for the quaternary compounds. According to powder photographs all compounds are isotypic. Struture determinations based on single crystal X‐ray data were performed with Zn11Rh18B8, Zn10FeRh18B8 and Zn10NiRh18B8. The structure of Zn11Rh18B8 is related to the Ti3Co5B2 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 Zn10MRh18B8 the zinc atoms in one sort of tetragonal prisms are replaced by M atoms.

Synthesis, single-crystal structure refinement and Fe/T site preference in the ternary borides FexT7−xB3 (T=Ru, Rh; 0<x≤1.5)

“…The other rhodium-involving interatomic distances, M1-M2 (average 2.76Å), Rh-M (average 2.77Å), and Rh-Rh (average 2.79Å) are longer than the rhodium metallic distance for CN 12, but still short enough for bonding interaction to be considered. Even wider Rh-Rh distances have been found in other [14], ScRh 3 B (2.88Å) [11] and Sc 2 M Rh 5 B 2 (average 2.90Å, M = Cr, Mn, Fe) [15].…”

Scaffolding, Ladders, Chains, and Rare Ferrimagnetism in Intermetallic Borides: Synthesis, Crystal Chemistry and Magnetism

“…Theoretical models based on the hypothetical "Ti 6 Fe 5 -Ru 18 B 8 " with iron fully occupying the two one-dimensional chain sites in combination with a rigid-band approach correctly predict the preferred magnetic structure for all of the structures discussed here. In fact, at low-iron content, i.e., Ti 9 …”

Electronic structure, chemical bonding, and magnetic properties in the intermetallic seriesSc2Fe(Ru1−xRhSamolyuk1, Fokwa2, Dronskowski3 et al. 2007Phys. Rev. B434350View full textAdd to dashboardCite

“…[1][2][3] Among these compounds, those with magnetically active 3d elements Mn, Fe, Co have attracted increased interest because they exhibit ferromagnetic or antiferromagnetic behavior that can be finetuned by synthetic means. In addition, the magnetically active 3d metal atoms form well separated, one-dimensional chains.…”