Phase equilibria and crystal structure of the ternary compounds of the La–Ag–Ga system in the region up to 50.0 at.% of La

Chem. Met. Alloys 3 (2010) 24-28

https://doi.org/10.30970/cma3.0118

Tetyana KRACHAN, Bogdan STELMAKHOVYCH

Phase diagrams of the La–Ag–Ga system at 500°С (La content 0-50.0 at.%) and 300°С (La content 0-33.3 at.%) have been built using X-ray structure and phase analysis. The existence of the ternary gallide LaAg_1.0-0.5Ga_3.0-3.5 (BaAl₄-type) has been confirmed and the atomic coordinates, displacement parameters and site occupancies have been determined. A new ternary compound, La(Ag_0.51Ga_0.49)₁₁ with BaHg₁₁-type structure (space group Pm3m, a = 0.87619(1) nm, wR_p = 0.072), has been discovered at 300°С.

Part of the phase diagram isothermal section of the of the La–Ag–Ga system at 300°C and 500°C.

Keywords

La–Ag–Ga alloys / Phase equilibria / Ternary intermetallic compounds / Crystal structure / X-ray diffraction