New ternary phases in the LuNiSi system

 

Chem. Met. Alloys 6 (2013) 209-213

 

Bohdana BELAN, Yaroslav TOKAYCHUK, Mykola MANYAKO, Roman GLADYSHEVSKII

 

The existence of three new ternary compounds, LuNiSi3, LuNiSi, and LuNi0.61Si1.39, was established in the LuNiSi 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 LuNi0.61(2)Si1.39(2) to the structure type AlB2, hP3, P6/mmm, a = 3.94594(10), c = 3.87276(10) Å. The compound LuNi0.61Si1.39 has a homogeneity range of LuNi0.27‑0.67Si1.73‑1.33 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 LuNi0.27-0.67Si1.73-1.33.

 

Keywords

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