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While trying to react NbBr 5  with sulfur in a closed tube, crystals of the new modification β-NbBr 5  were obtained. Its X-ray diffraction patterns have sharp reflexions and diffuse streaks showing the presence of a one-dimensional disorder. From the sharp reflexions alone, a statistically averaged sub-structure results; it has the space group Ccmm and the lattice constants a 0  = 644, b 0  = 1867 and c 0  = 615 pm. Taking into account the diffuse streaks, the true structure was deduced; its lattice constants are a = 2a 0 , c = Co, b indefinite due to the disorder. β-NbBr 5  is isostructural to tantalum pentaiodide. It consists of layers of (NbBr 5 ) 2  molecules that are stacked with displacement faults in the direction of b. The bromine atoms have a hexagonal close-packing arrangement.

zeitschrift für naturforschung b

β-NbBr 5 , eine neue Modifikation von Niobpentabromid mit einer eindimensionalen Lagenfehlordnung/ β-NbBr 5 , a New Modification of Niobium Pentabromide Having One-Dimensional Stacking Disorder