Confirmation of the crystal structure of PrNi9Si4

Confirmation of the crystal structure of PrNi₉Si₄

Chem. Met. Alloys 10 (2017) 40-44

https://doi.org/10.30970/cma10.0360

Bohdana BELAN, Svitlana PUKAS, Mykola MANYAKO, Anna GAGOR, Roman GLADYSHEVSKII

The crystal structure of PrNi₉Si₄ was refined on X-ray single-crystal diffraction data. It was confirmed that the compound crystallizes in the tetragonal system, space group I4/mcm (a = 7.8335(11), c = 11.466(2) Å, Z = 4; R = 0.0284, wR = 0.0703 for 209 independent reflections and 25 variables). The structure belongs to the structure type CeNi_8.5Si_4.5, but shows ordered distribution of the atoms with the Si atoms occupying exclusively one of the sites in Wyckoff position 16l.

Atom ordering in the structure of PrNi₉Si₄ compound compared with the models proposed for Pr_0.693Co₉Ge₄ and CeNi_8.5Si_4.5.

Keywords

Praseodymium / Nickel / Silicon / X-ray single crystal diffraction / Crystal structure