Abstract
AuTa5S was prepared from a compressed mixture of tantalum disulfide, tantalum, and gold in a sealed tantalum capsule at 1650 K within 2 days. Above 1750 K the sulfide disproportionates in the solid state. The structure of AuTa5S (a=1250.82(3) pm,F43m,Z=16, Pearson symbolcF112) was determined from integrated X-ray powder diffraction intensities by direct methods and subsequently refined by fitting the profiles (13 structure variables,Rwp=0.036). Three of five crystallographically distinct metal atoms have distorted icosahedral coordinations. Sulfur is trigonal antiprismatically coordinated by tantalum. The structure is composed of two mutually interpenetrating zinc blende-like frameworks consisting of corner-connected STa6octahedra and corner-connected Au4Ta4and Ta4Ta4stellae quadrangulae. The unique structure of AuTa5S represents a link between two major intermetallic structure families, theΡ-carbide-type and the Mn23Th6-type structures.
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