New real ternary and pseudoternary phases in the Li–Au–In system

Abstract

Two real ternary lithium gold indides LiAu 2In and Li 280Au 22In 130 (Li 0.65Au 0.05In 0.30) were found in the Li–Au–In system. They are isostructural to the respective Ag-alloys. LiAu 2In crystallizes in the MnCu 2Al-type structure ( Fm-3 m, Heusler phase, a=6.4982(8) Å, based on single crystal XRD-data) and Li 280Au 22In 130 in the Li 278Ag 40In 114-type structure ( F-43 m, a=19.9970(2) Å, based on powder XRD-data). The analogy of the two ternary systems Li–Au–In and Li–Ag–In is additionally reaffirmed by the wide homogeneity range of the pseudoternary solid solution with NaTl-type structure (Zintl phase),which expands not only in the direction of the quasibinary cut Li(Au x In 1− x ) with 0≤ x≤0.5, but also into the directions of both higher and lower Li-concentrations.