The synthesis, physicochemical, spectroscopic, and structural characterization of the compounds β-K2Bi8Se13, K2Sb8Se13, K2.5Bi8.5Se14, and K2.5Sb8.5Se14 have been previously reported and show promising properties for thermoelectric applications. While β-K2Bi8Se13 is isostructural with K2Bi8Se13, the isostructural K2.5Bi8.5Se14 and K2.5Sb8.5Se14 are different but have similar structural features to β-K2Bi8Se13. Compared with α-K2Bi8Se13, which has a room temperature electrical conductivity of 2 S/cm and a Seebeck coefficient ranging from -210 to -260 μV/K, β-K2Bi8Se13 shows excellent electrical conductivity values at room temperature while maintaining high Seebeck coefficients. In this work the doping of the homologous compound β-K2Bi8Se13 was explored by employing varying concentrations of different dopants. Where possible, transport measurements were carried out on both single crystal and polycrystalline ingot material. From these data the trends in the key parameters were identified for optimizing the power factor and figure of merit.
|Number of pages||4|
|Journal||International Conference on Thermoelectrics, ICT, Proceedings|
|Publication status||Published - Dec 1 1999|
|Event||18th International Conference on Thermoelectrics (ICT'99) - Baltimore, MD, USA|
Duration: Aug 29 1999 → Sep 2 1999
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