Abstract
Single-phased samples of the medium-entropy BiSbTe1.5Se1.5 (low-temperature thermoelectric with electron con- ductivity) and PbSnTeSe (mid-temperature thermoelectric with hole conductivity) compounds have been prepared by reactive spark plasma sintering of powder mixtures consisting of relevant elemental metals. The samples prepared are grained. Plate- like grains with average grain size of ∼ 3.3 μm are observed in BiSbTe1.5Se1.5, whereas irregularly-shaped grains with average grain size of ∼ 18.9 μm are typical for PbSnTeSe. Highest value of the thermoelectric figure-of-merit of the samples is equal to ∼ 0.43 (at 500 K for BiSbTe1.5Se1.5) and ∼ 0.35 (at 725 K for PbSnTeSe).
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