The ternary system Sm–Ga–Sn: isothermal section of the phase diagram at 600°C and crystal structures of the compounds

Chem. Met. Alloys 8 (2015) 112-122

https://doi.org/10.30970/cma8.0330

Yaroslav TOKAYCHUK

The isothermal section at 600°C of the phase diagram of the ternary system Sm–Ga–Sn was constructed using X-ray powder diffraction data. Limited solid solutions based on the binary compounds SmSn₃ (30 at.% Ga), Sm₅Ga₃ (13.3 at.% Sn), Sm₅Sn₃ (4 at.% Ga), and SmGa (3 at.% Sn) were observed. Three ternary compounds were found at 600°C: Sm₃Ga_0.80-2.48Sn_4.20-2.52 (ternary variant of the structure type Pu₃Pd₅, Pearson symbol oS32, space group Cmcm, a = 9.97522(18)-9.89433(18), b = 8.02642(16)-7.87246(16), c = 10.23304(19)-9.91703(19) Å), Sm₁₁Ga_2.30Sn_7.70 (ternary variant of the structure type Ho₁₁Ge₁₀, tI84, I4/mmm, a = 11.5876(4), c = 17.3089(5) Å), and Sm₅Ga_0.76Sn_2.24 (structure type Nb₅SiSn₂, ternary variant of W₅Si₃, tI32, I4/mcm, a = 12.1881(14), c = 6.0919(7) Å). The ternary phases are characterized by partial ordering of the Ga and Sn atoms.

Isothermal section of the phase diagram of the ternary system Sm–Ga–Sn at 600°C

Keywords

Samarium / Gallium / Tin / Phase diagram / X-ray powder diffraction / Crystal structure / Solid solution