Acta Cryst. (2006). E62, i106-i108  [ doi:10.1107/S1600536806011159 ]

Copper deficiency in UCu_5-xSn [x = 0.37 (1)]

S. Bobev, E. D. Bauer and J. L. Sarrao

Abstract: The ternary intermetallic title compound, known hitherto as UCu₅Sn (uranium pentacopper stannide), crystallizes with the hexagonal CeNi₅Sn structure type, and it has been presumed to be a fully stoichiometric phase, devoid of any disorder. However, the present single-crystal X-ray diffraction studies at 120 K, carried out with crystals grown from an Sn flux, suggest the existence of a previously unnoticed phase width of the title compound UCu_5-xSn. All the atoms occupy special positions: U (m2, m.), Sn (3m.) and Cu (.m., 3m., and two positions with m2).

Online 31 March 2006

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