Interaction of the components in the system Lu–Ag–Ge at 500°С

Chem. Met. Alloys 11 (2018) 1-5

https://doi.org/10.30970/cma11.0376

Bohdana Belan, Mykola Manyako, Roman Gladyshevskii

The isothermal section of the phase diagram of the Lu–Ag–Ge system at 500°С was investigated based on X‑ray diffraction and microstructure analysis. The binary compound LuAg₂ (structure type MoSi₂, Pearson symbol tI6, space group I4/mmm) was found to dissolve up to 20 at.% Ge: a = 3.6297(6)-3.6292(6), c = 9.191(7)-9.2341(7) Å. The other binary compounds of the Lu–Ag and Lu–Ge systems dissolve not more than 5 at.% of the third component. The ternary compound LuAgGe (structure type ZrNiAl, Pearson symbol hP9, space group P-62m, a = 7.0677(4), c = 4.1665(3) Å) was confirmed. An additional, new phase with unknown structure was observed in an alloy of nominal composition Lu₅₂Ag₉Ge₃₉.

Isothermal section of the phase diagram of the Lu–Ag–Ge system at 500°С.

Keywords

Lutetium / Silver / Germanium / Phase diagram / Crystal structure / Ternary compound