(A) Compression strength, compression strain and bending strength for Ag₂Se_1–xTe_x samples. (B) Fracture toughness K_IC for Ag₂Se_1–xTe_x samples; data of Bi_0.5Sb_1.5Te₃ [6], Mg₃Sb_1.3Bi_0.7 [31], PbTe [34] are also given for comparison. (C) Schematic illustration of energy absorption (modulus of toughness) for Ag₂Se under compression test. (D) Modulus of toughness for Ag₂Se, Ag₂Se_0.9Te_0.1 and other typical thermoelectric materials [12,30,35]. The error bars in panels A, B, and D denote the standard deviation from multiple measurements.