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Thermoelectric materials Ag0.8Pb18SbTe20 alloyed with Se in the composition of Ag0.8Pb18SbTe20–x Sex (x = 0, 5, 10, 15) were prepared by a high‐pressure method. The composition dependence of transport properties was studied from 100 K to room temperature. The thermal conductivity of Ag0.8Pb18SbTe20 was depressed sharply by alloying with Se, and the Seebeck coefficient and resistivity were tuned effectively...
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