Li13.7Rh8Si18.3 – A Non-Centrosymmetric Variant of the R-Phase Structure
نویسندگان
چکیده
The silicide Li13.7Rh8Si18.3 was synthesized from the elements in a sealed niobium ampoule at 1370 K followed by slow cooling. The sample was studied by powder and single-crystal X-ray diffraction. Li13.7Rh8Si18.3 crystallizes with a non-centrosymmetric occupancy variant of the R-phase structureMg32(Al, Zn)49: I23, a = 1306.9(2) pm,wR2 = 0.0447, 1286 F2 values, and 53 variables. Striking structural motifs of the Li13.7Rh8Si18.3 structure areM12 icosahedra andM60 buckyball-type clusters (M = Si + Rh), both partially built up from mixed-occupied sites.
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