Abstract
Single crystals of the high-pressure phase Ce7Au13+xGe10-x were obtained by treating CeAuGe at 9:5 GPa and 1473 - 1523 K in a multi-anvil press. The structure of Ce7Au13:35Ge9:65 was refined on the basis of single-crystal X-ray diffractometer data: new type, Pbam, a = 1571:9(3), b = 1780:3(4), c = 443:58(9) pm, wR2 = 0:0470, 2017 F2 values, 96 variables. Two of the five germanium sites show a small degree of Ge/Au mixing. The gold and germanium atoms build up a complex threedimensional, covalently bonded [Au13:35Ge9:65] network with Au-Ge distances ranging from 249 to 293 pm. The [Au13:35Ge9:65] network also exhibits a one-dimensional gold cluster with Au-Au distances of 275 - 301 pm and a weakly bonded germanium dumb-bell with a Ge4-Ge5 bond length of 271 pm. The four crystallographically independent cerium atoms fill cavities of coordination numbers 19 and 20 within the [Au13:35Ge9:65] network. These coordinations are known from other structure types. Consequently one can describe the Ce7Au13:35Ge9:65 structure as an intergrowth variant of Eu- AuGe, HP-CeAuGe (TiNiSi), CeAu2Ge2 (CePt2Ge2), and Ce3Ag4Ge4 (Gd3Cu4Sn4) related slabs.
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