New ternary phases in the Lu–Ni–Si system

Chem. Met. Alloys 6 (2013) 209-213

https://doi.org/10.30970/cma6.0284

Bohdana BELAN, Yaroslav TOKAYCHUK, Mykola MANYAKO, Roman GLADYSHEVSKII

The existence of three new ternary compounds, LuNiSi₃, LuNiSi, and LuNi_0.61Si_1.39, was established in the Lu–Ni–Si system, and their crystal structures were refined from X-ray powder diffraction data. The structure of the compound LuNiSi₃ belongs to the structure type SmNiGe₃, Pearson symbol oS20, space group Cmmm, a = 3.88279(8), b = 20.8179(4), c = 3.89111(8) Å, that of LuNiSi to the structure type TiNiSi, oP12, Pnma, a = 6.67857(10), b = 4.09340(6), c = 7.11618(10) Å, and that of LuNi_0.61(2)Si_1.39(2) to the structure type AlB₂, hP3, P6/mmm, a = 3.94594(10), c = 3.87276(10) Å. The compound LuNi_0.61Si_1.39 has a homogeneity range of LuNi_0.27‑0.67Si_1.73‑1.33 at 600 °C and is characterized by a statistical mixture of Ni and Si atoms. The other two compounds have point compositions and ordered distribution of the atoms.

Cell parameters versus Ni content within the homogeneity range of the ternary phase LuNi_0.27-0.67Si_1.73-1.33.

Keywords

Intermetallic compound / Lutetium / Nickel / Silicon / X-ray powder diffraction / Crystal structure