Acta Cryst. (2006). E62, i77-i79  [ doi:10.1107/S1600536806007288 ]

Uranium and aluminium order-disorder in U_1-xPt₂Al_7-6x [x = 0.33 (1)]

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

Abstract: The new ternary title compound, uranium diplatinum pentaaluminium, has been synthesized from a reaction of the corresponding elements at 1273 K. It crystallizes in the rare hexagonal Ce₂Pt₆Ga₁₅ structure type, where one-third of the U atoms are randomly replaced by triangles of Al atoms. Possible ordered models in hexagonal and ortho-hexagonal supercells were tried without success. All the atoms occupy special positions: U (m2), Pt (3m.), and Al (mm2, 3m. and 3m.).

Online 3 March 2006

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