New quaternary alumosilicides with Y₃NiAl₃Ge₂-type structures

Chem. Met. Alloys 13 (2020) 65-69

https://doi.org/10.30970/cma13.0407

Nataliya SEMUSO, Yuliya PLYATSKO, Svitlana PUKAS, Roman GLADYSHEVSKII

Eight rare-earth nickel alumosilicides R₃NiAl₃Si₂ (R = Y, Gd, Tb, Dy, Ho, Er, Tm, Lu) were synthesized by arc melting and their crystal structures were studied by X-ray powder diffraction. They are isotypic to Y₃NiAl₃Ge₂, Pearson symbol hP9, space group P-62m. The hexagonal structure type Y₃NiAl₃Ge₂ (Z = 1) is a quaternary variant of the binary type Fe₂P (Z = 3) and the ternary types β₁-K₂UF₆, Lu₃CoGa₅, Zr₃Cu₄Si₂, and ZrNiAl. It belongs to a family of structures with trigonal prismatic coordination of the small atoms (Ni and Ge).

The structure type Y₃NiAl₃Ge₂.

Keywords

Quaternary alumosilicide / X-ray powder diffraction / Crystal structure / Isotypic compounds