New quaternary alumogermanides with the structure type SmNiAl4Ge2

 

Chem. Met. Alloys 11 (2018) 18-22

 

Maryana 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