Abstract
The isothermal section of the Tb–Ag–Ga system at 873 K has been constructed in the region up to 70 at.% Ga. The interaction between components in the region with higher gallium content has been studied at 573 K. The composition limits of the solid solution ranges of the binary compounds and the homogeneity ranges of the ternary ones have been determined. The existence of earlier known ternary gallides Tb 3Ag 2.8Ga 8.2 (La 3Al 11-type), TbAg 0.4–0.7Ga 1.6–1.3 (CaIn 2-type), TbAg 0.9–1.2Ga 1.1–0.8 (KHg 2-type) has been confirmed. The compounds TbAg 0.5Ga 3.5 (unknown structure), Tb 4Ag 0.9Ga 12.1 (Y 4PdGa 12-type, space group Im 3m , α=0.86537(2) nm, R Brag=0.039), and TbAg 1.2Ga 1.8 (β-YbAgGa 2-type, space group Pnma, a=0.69742(3), b=0.43587(1), c=1.02098(7) nm, R I=0.070) have been found for the first time.
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