Abstract
The out-of-equilibrium samples show highest values of figure-of-merit, ZTmax, up to 2.1.
Highlights
Among the thermoelectrics suitable for applications, PbTebased materials reveal outstanding performance
One disk was first used for thermal diffusivity measurement (Netzsch laser flash measurement (LFA) 457), and cut for electric transport measurements
The high ZT values of the Pb0.98ÀxNa0.02EuxTe system are presented in ref. 74 (ZTmax = 1.8) and ref. 63 (ZTmax = 2.2)
Summary
Among the thermoelectrics suitable for applications, PbTebased materials reveal outstanding performance. Among the 4f rare-earth elements, substitution by Eu has been proven to significantly influence the band structure of PbTe.[51,52] Thin films of Pb1ÀxEuxTe containing quantum wells have been predicted theoretically and confirmed experimentally as a route towards enhanced thermoelectric properties at room temperature (RT).[11,53,54,55] no significant. The solubility of Na in PbTe was recently shown to be more complex than expected: Na forms two different local arrangements in the crystal structure of PbTe.[36] there are several previous publications on p-type PbTe materials with high values of ZT (Table 1), and Pb1ÀxÀyEuxNayTe have been reported,[63] there are only a few investigations about the stability (chemical and physical properties) of the studied materials.[20,64,65,66] different compositions reported in different publications reveal problems in the reproducibility of the results. We discuss the possibility of using these materials for the thermoelectric applications, based on thermal stability studies of variously heat-treated samples
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