Abstract
Pb, Te, Ag and Se, when reacted in a 1:1: x:1 ( x = 1.9, 2.0, 2.01) molar ratio, form a two phase composite which consists of a phase which crystallizes in the fcc cubic PbSe structure and a phase that crystallizes in the Ag 2Te structure. In this article, we demonstrate that by varying the Ag concentration, we can manipulate which variant of the Ag 2Te structure stabilizes at room temperature (monoclinic α-Ag 2Te or cubic β-Ag 1.9Te) and can consequently manipulate the electrical and thermal transport behavior of the composite and hence the thermoelectric performance. Additionally, we show that Cu-doping results in an overall improvement in thermoelectric performance. Our results suggest that formation of composites is a viable path for achieving a phonon-glass-electron-crystal (PGEC) alloy.
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