Structure refinements of the compounds Pr₅Si₃ and Zr₃Si₂

Chem. Met. Alloys 7 (2014) 56-62

https://doi.org/10.30970/cma7.0278

Marina BOYKO, Nataliya MUTS, Ihor MUTS, Roman GLADYSHEVSKII

The structures of the compounds Pr₅Si₃ and Zr₃Si₂ were refined on X-ray single-crystal diffraction data. Pr₅Si₃ crystallizes with the tetragonal structure type Cr₅B₃: space group I4/mcm, Pearson symbol tI32, a = 0.7820(1), c = 1.3812(3) nm, Z = 4, R1 = 0.035, wR2 = 0.080 for 287 unique reflections, 16 refined parameters. Zr₃Si₂ crystallizes with the tetragonal structure type U₃Si₂: Pearson symbol tP10, space group P4/mbm, a = 0.7087(1), c = 0.37060(7) nm, Z = 2, R1 = 0.022, wR2 = 0.042 for 114 unique reflections, 12 refined parameters.

Selected interatomic distances for the site Pr2 in Pr₅Si₃ (the displacement ellipsoids of the atoms are shown with 99 % probability level)

Keywords

Praseodymium / Zirconium / Silicide / Arc-melting / High-frequency furnace / Crystal structure / X-ray diffraction