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), HfGa0.1Sb0.9
(FeSi, cP8, P213, a = 5.5752(3) Å), Hf5GaSb3 (Hf5CuSn3,
hP18, P63/mcm,
a = 8.4747(5), c = 5.7190(5) Å), and Hf5Ga1.84-0.72Sb1.16-2.28 (Nb5SiSn2,
tI32, I4/mcm,
a = 10.84972(15),
c = 5.50154(8) Å for composition Hf5Ga1.51(2)Sb1.49(2)). The ternary phases, except HfGa0.1Sb0.9,
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