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
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: Sm3Ga0.80-2.48Sn4.20-2.52
(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), Sm11Ga2.30Sn7.70
(ternary variant of the structure type Ho11Ge10, tI84, I4/mmm, a = 11.5876(4),
c = 17.3089(5) Å),
and Sm5Ga0.76Sn2.24 (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