Аннотация:Isothermal sections of the Ag–Pd–Sn system at 500 and 800 ◦C were plotted based on the XRD and EDX results.The solubility of Sn in palladium and silver-based fcc solid solution has nearly zero minimum around the Agcorner. The Pd3Sn and γ-Pd2–xSn phases show significant dissolution of Ag and extend towards the Ag corner. Theother Pd–Sn and Ag–Sn binary phases dissolve under 5 at.% of the third component. A new τ1 ternary phase wasdiscovered in the Pd-rich region. Its XRD pattern corresponds formally to In structure type, but the actualarrangement of the atoms in the τ1 phase most probably corresponds to tetragonal Al3Ti type structure.