Abstract
AbstractThe gold‐rich intermetallic phase Ca4Au10Zn3 was synthesized from the elements by high‐frequency melting in sealed tantalum ampoules. Analyses of the sample by X‐ray powder and single crystal diffraction indicated a new structure type with a small homogeneity range resulting from Au/Zn mixing: C2/c, a = 1598.4(2), b = 819.7(1), c = 1188.2(2) pm, β = 120.93(1)°, wR2 = 0.0397, 2292 F2 values, 83 variables for Ca4Au9.66(1)Zn3.34(1), and a = 1596.6(2), b = 818.8(2), c = 1187.1(2) pm, β = 120.91(2)°, wR2 = 0.0280, 2296 F2 values, 83 variables for Ca4Au9.98(1)Zn3.02(1). The gold atoms built up a three‐dimensional distorted tetrahedral network with Au–Au distances ranging from 274–294 pm. The cavities within this network are filled by calcium atoms and Zn3 triangles (272–279 pm Zn–Zn) in an ordered manner. The small homogeneity range Ca4Au10–xZn3+x concerns Au/Zn mixing within the triangles and the tetrahedral network as well. The crystal chemical relationship with the aristotype AlB2 is discussed on the basis of a group‐subgroup scheme.
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