The Li–Ag–In ternary system

Chem. Met. Alloys 17 (2024) 13-23

Grygoriy DMYTRIV, Volodymyr PAVLYUK, Ivan TARASIUK, Ihor CHUMAK, Helmut EHRENBERG, Anatoliy SYNYSHYN, Hermann PAULY

https://doi.org/10.30970/cma17.0440

The interaction of the components in the Li–Ag–In system was studied in the whole concentration range based on X-ray and neutron powder diffraction. The crystal structure of the binary compound Li₃Ag was solved and refined from X-ray powder diffraction data. Three ternary compounds (LiAg₂In, Li₂₇₈(In,Ag)₁₅₄, and Li_2-xAg_1+xIn₃) were observed under the conditions of the experiment. The Heusler phase LiAg₂In crystallizes in a MnCu₂Al-type structure (Fm-3m, a = 6.5681(5) Å). The intermetallic compound Li₂₇₈(In,Ag)₁₅₄ adopts a 6 × 6 × 6 superstructure of the cubic W-type (F-43m, a = 20.089(2) Å), and the third compound, Li_2-xAg_1+xIn₃, crystallizes in an own structure type (Pmma, a = 9.325(3) Å, b = 3.198(1) Å, c = 8.043(3) Å). The remarkably broad homogeneity range of the NaTl-type Zintl phase extending from LiIn into the ternary region was determined and the distribution of the atoms was obtained from refinements on X-ray and neutron diffraction data. A wide homogeneity range was also established for the binary compound Ag₃In.

Subsolidus relations in the Li–Ag–In system (as cast).

Keywords

Phase diagram / Intermetallics / Crystal structure / Lithium