Abstract
AbstractThe gallide LaRh3Ga2 was obtained by arc‐melting of the elements and subsequent annealing of the product button in a high‐frequency furnace. The sample was studied by powder X‐ray diffraction and the structure was refined from single crystal data of a trilling: ErRh3Si2 type (CaCu5 superstructure), Imma, a = 760.1(2), b = 975.6(3), c = 564.0(2) pm, wR = 0.0358 for 717 F2 values and 23 variables; domain ratio 0.36(1) / 0.28(1) / 0.35(1). The rhodium atoms build up Kagomé networks (281.8 and 282.2 pm Rh–Rh), which are condensed through the gallium atoms (249.6–251.0 pm Rh–Ga). The lanthanum atoms fill large voids left by the three‐dimensional [Rh3Ga2] network. They have coordination number 18 (6 Ga + 12 Rh) in form of a hexa‐capped hexagonal prism. The crystal chemical relationship with the aristotype CaCu5 is briefly discussed on the basis of a group‐subgroup scheme.
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