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Thermoelectric Properties of Te-Doped Ba0.32Co4Sb12−xTexPrepared at HPHT

Polycrystalline skutterudites Ba0.32Co4Sb12−xTex (nominally x = 0.1–0.7) are synthesized by the high pressure and high temperature (HPHT) method. The influence of Te substitution on electrical transport properties are investigated in the temperature range of 300–710K. All the samples show n-type conduction. It is found that the presence of Te substantially decreases electrical resistivity without any detrimental effect on the Seebeck coefficients, which improves the power factor. Among all the samples, Ba0.32Co4Sb11.5Te0.5 shows the highest thermoelectric figure of merit of 0.76 at 710 K.