The ternary system Hf–Ga–Sb at 600ºC

Chem. Met. Alloys 6 (2013) 75-80

https://doi.org/10.30970/cma6.0260

Iryna TOKAYCHUK, Yaroslav TOKAYCHUK, Roman GLADYSHEVSKII

The isothermal section at 600ºC of the phase diagram of the ternary system Hf–Ga–Sb was constructed in the whole concentration range, using X-ray powder diffraction. Limited solid solutions based on the binary compounds HfGa (17 at.% Sb), Hf₅Ga₃ (11 at.% Sb), and Hf₅Sb₃ (3 at.% Ga) were observed. Four ternary compounds form at 600ºC: Hf₂GaSb₃ (structure type Zr₂CuSb₃, Pearson symbol tP6, space group P-4m2, a = 3.89841(8), c = 8.62650(19) Å), HfGa_0.1Sb_0.9 (FeSi, cP8, P2₁3, a = 5.5752(3) Å), Hf₅GaSb₃ (Hf₅CuSn₃, hP18, P6₃/mcm, a = 8.4747(5), c = 5.7190(5) Å), and Hf₅Ga_1.84-0.72Sb_1.16-2.28 (Nb₅SiSn₂, tI32, I4/mcm, a = 10.84972(15), c = 5.50154(8) Å for composition Hf₅Ga_1.51(2)Sb_1.49(2)). The ternary phases, except HfGa_0.1Sb_0.9, are characterized by full or partial ordering of the Ga and Sb atoms.

Isothermal section of the phase diagram of the system Hf–Ga–Sb at 600ºC

Keywords

Hafnium / Gallium / Antimony / X-ray powder diffraction / Phase diagram / Crystal structure / Solid solution