(A) Average values of the compression strength and ultimate strain for Ag₂Se_1–xTe_x samples in this work (red stars); data of Ag₂Se [27,28,33], Ag₂Te [23,26], Ag₂Te_1–ySe_y [26] and Bi₂Te₃-based polycrystalline thermoelectric materials [6,12–14,17–19] are included for comparison. Raw data are listed in Table S1. (B) Comparison of mechanical and physical properties between Ag₂Se_0.9Te_0.1 and typical Bi₂Te₃-based polycrystalline thermoelectric materials [6,12].