Thermoelectric properties of InxPbxCo4Sb12 prepared by HPHT

We prepared InxPbxCo4Sb12 by high-pressure and high-temperature (HPHT) method. Samples were characterized by X-ray diffraction (XRD), electron microprobe analysis and thermoelectric properties measurements. The Seebeck coefficient, electrical resistivity and thermal conductivity of InxPbxCo4Sb12 samples were all performed in the temperature range of 323–723K. With the increasing synthetic pressure, the Seebeck coefficient of In0.5Pb0.1Co4Sb12 samples, which synthesized between 1.5 GPa–2.3 GPa, showed an obvious increase while the thermal conductivity exhibited a substantial reduction.