Abstract
The orthorhombic indide Sr5Au13.5In8.5 was obtained during phase-analytical studies of the Sr-Au-In system. This new indide is formed upon melting of the elements in a sealed tantalum tube. Sr5Au13.5In8.5 was characterized on the basis of powder and single-crystal X-ray diffraction: Pmmn, a = 476.37(9), b = 2927.5(9), c = 894.9(2) pm, wR2 = 0.056, 2355 F2 values, 87 variables. The structure is of a new type. The gold and indium atoms build up a complex three-dimensional [Au13.5In8.5] polyanionic network in which the strontium atoms fill channels which extend in the a direction. One site within the polyanion shows Au/In mixing. The Sr5Au13.5In8.5 structure is composed of SrAu3In3 -and SrAu-related slabs
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