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