作者:Alexandra Neumann、A. Kjekshus、C. Rømming、E. Røst
DOI:10.1016/0022-4596(95)80021-g
日期:1995.10
A hitherto unknown, virtually stoichiometric phase with composition AuNi2Sn4 has been identified in the Au-Ni-Sn system, and its structure has been determined by direct methods. The unit cell is rhombohedral (space group: R(3) over barm$) with dimensions a = 422.6(1) pm and c = 2656.6(4) pm in the hexagonal setting and a = 918.2(2) pm and alpha = 26.60(1)degrees in the rhombohedral setting. According to the hexagonal description Au is in 3b and Ni, Sn(I), and Sn(II) are in 6c with z = 0.40091(6), 029965(3), and 0.11204(3), respectively. AuNi2Sn4 proves to be isostructural with the mineral smythite (Fe3S4-s). The Fe3S4-s-type structure belongs to the NiAs-type family and certain aspects of the structural relationships are briefly discussed. (C) 1995 Academic Press,Inc.