Fig. 8: Comparisons on the thermoelectric properties of Te composites with MVB and non-MVB tellurides.
From: Metavalently bonded tellurides: the essence of improved thermoelectric performance in elemental Te
Temperature dependences of a electrical conductivity (σ), b Seebeck coefficient (S), c power factor (PF), d total thermal conductivity (κtot), e lattice thermal conductivity (κL), and f thermoelectric figure-of-merit (zT) for samples Te0.98M0.02 (M = Ge, Sn, Zn, and Cd). The unified doping content of 2% was applied here for ease of verification of our proof-of-principle. g−i 3D APT reconstruction and the corresponding PME maps of different telluride precipitates in doped Te materials. The GeTe and SnTe precipitates present high PME values corresponding to metavalent bonding, while the ZnTe precipitate exhibits a low PME value corresponding to covalent bonding. Note that the size of these precipitates is larger than the field of view of APT measurements, and thus the interface is not included.
