The ternary system Gd–Ge–Sb at 600°C

Chem. Met. Alloys 15 (2022) 12-16

https://doi.org/10.30970/cma15.0423

Roman DANKEVYCH, Yaroslav TOKAYCHUK

The isothermal section at 600°C of the phase diagram of the ternary system Gd–Ge–Sb was constructed in the whole concentration range, based on X-ray powder diffraction and energy-dispersive X-ray spectroscopy. The formation of a continuous solid solution Gd₅Ge_3-xSb_x (x = 0-3, structure type Mn₅Si₃, Pearson symbol hP16, space group P6₃/mcm, a = 8.5702(8)-8.9745(6), c = 6.4305(5)-6.3431(4) Å) and limited solid solutions based on the binary compounds Gd₁₁Ge₁₀ (6 at.% Sb), Gd₅Ge₄ (10 at.% Sb), GdSb (6 at.% Ge), and Gd₄Sb₃ (28 at.% Ge) was established. Three ternary compounds were found in the system at 600°C: Gd₆Ge_4.3Sb_11.7 (own structure type, oI46, Immm, a = 4.1420(4), b = 10.4411(9), c = 26.228(2) Å), Gd₂Ge_3.28Sb_0.65 (structure type Gd₂Ge_3.38Bi_0.42, oS32, Cmcm, a = 4.0198(2), b = 30.3729(18), c = 4.1340(2) Å), and Gd₅Ge_2.0-0.9Sb_2.0-3.1 (structure type Eu₅As₄, oS36, Cmce, a = 12.241(7), b = 8.025(3), c = 8.039(3) Å for Gd₅Ge_0.90(12)Sb_3.10(12)).

Isothermal section of the phase diagram of the ternary system Gd–Ge–Sb at 600°C.

Keywords

Gadolinium / Germanium / Antimony / X-ray powder diffraction / Energy-dispersive X-ray spectroscopy / Phase diagram / Solid Solution / Ternary compound / Crystal structure