Six rare-earth nickel alumogermanides RNiAl 4 Ge 2 (R = Gd, Tb, Dy, Ho, Tm, Lu) were synthesized by arc melting and their crystal structures were studied by X-ray powder diffraction. They are isotypic to SmNiAl 4 Ge 2 , Pearson symbol hR24, space group R-3m. The structures of the RNiAl 4 Ge 2 compounds can be described as formed by two types of alternating slabs. The first type of slab is built up of cubes of composition Al 8 , every second cube being centered by a Ni atom, and the second one is formed by octahedra of composition Ge 6 , every second octahedron being centered by an R atom.Rare-earth nickel alumogermanide / X-ray powder diffraction / Crystal structure
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