Phase diagrams of the Tb–Ag–In and Dy–Ag–In systems at 870 K

The phase equilibria of Tb–Ag–In and Dy–Ag–In ternary systems have been studied at 870 K in the whole concentration range by means of X-ray powder, single crystal X-ray diffraction and EDX analyses. Isothermal sections of Tb–Ag–In and Dy–Ag–In phase diagrams at this temperature have been constructed. Both systems are characterized by formation of three ternary compounds: REAg3In3 (YbAg2In4-type, space group Im-3), REAg2In (MnCu2Al-type, space group Fm-3m) and RE2AgIn3 (CaIn2-type, space group P63/mmc) RE=Tb, Dy. Homogeneity ranges of the ternary phases with CaIn2 structure type lies from 35 to 60 at% of In for Tb-containing phase and from 39 to 50 at% of In for Dy-containing phase. The existence of solid solutions based on REAg (CsCl-type, space group Pm-3m) binary compounds up to 30 at% of In and REIn3 (AuCu3-type, space group Pm-3 m) binary compounds up to 5 at% of Ag has been found.