New quaternary alumogermanides with the structure type SmNiAl₄Ge₂

Chem. Met. Alloys 11 (2018) 18-22

https://doi.org/10.30970/cma11.0379

Mar’yana PETROVSKA, Nastasia KLYMENTIY, Svitlana PUKAS, Roman GLADYSHEVSKII

Six rare-earth nickel alumogermanides RNiAl₄Ge₂ (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 SmNiAl₄Ge₂, Pearson symbol hR24, space group R-3m. The structures of the RNiAl₄Ge₂ compounds can be described as formed by two types of alternating slabs. The first type of slab is built up of cubes of composition Al₈, every second cube being centered by a Ni atom, and the second one is formed by octahedra of composition Ge₆, every second octahedron being centered by an R atom.

The structure type SmNiAl₄Ge₂.

Keywords

Rare-earth nickel alumogermanide / X-ray powder diffraction / Crystal structure