Abstract
Single-phased high-entropy (Bi2/3Sb1/3)2(Te2/5Se2/5S1/5)3 alloy with homogeneous distribution of various elements was prepared by way, based on preliminary growing single-crystalline precursor that was after grinding applied as starting powder for spark plasma sintering. Thermoelectric properties of the alloy were analyzed in comparison with medium-entropy BiSbTe1.5Se1.5 alloy. For both alloys, specific features in the properties due to intrinsic conductivity were observed. Owing to narrow energy gap (∼0.083 eV), these features for (Bi2/3Sb1/3)2(Te2/5Se2/5S1/5)3 are remarkably shifted to low temperatures. With growing temperature, thermoelectric figure-of-merit of high-entropy alloy increases to ∼0.3 at 570 K.
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