The Y–Ag–Ga system

Abstract

The isothermal section at 670 K of the Y–Ag–Ga system in the region of 0–33 at.% Y has been constructed using X-ray diffraction data. The existence of earlier known ternary gallides has been confirmed. Their homogeneity regions, atomic coordinates and distribution of atoms in the structures have been determined: Y 3Ag 2.55Ga 8.45 (La 3Al 11-type structure, a = 0.4310(1) nm, b = 1.2865(3) nm, c = 0.9552(3) nm, R F = 0.043), YAg 0.22Ga 1.78 (CaIn 2-type structure, a = 0.44565(1) nm, c = 0.72032(2) nm, R I = 0.081), YAg 0.74Ga 1.26 (KHg 2-type structure, a = 0.45302(2) nm, b = 0.70805(3) nm, c = 0.78056(3) nm, R I = 0.059). The crystal structure of the new ternary compound YAg 1.1Ga 1.9 (β-YbAgGa 2-type structure, Pnma, a = 0.69654(3) nm, b = 0.43391(2) nm, c = 1.02126(5) nm, R I = 0.087) has been studied for the first time.