Abstract
In this work the synthetic conditions for K 2Bi 8Se 13 and their effect on its thermoelectric properties were investigated. K 2Bi 8Se 13 was prepared as a single phase using K 2Se and Bi 2Se 3 as starting materials in a furnace or via a reaction using direct flame, followed by remelting or annealing. Seebeck coefficient measurements showed that the doping level in the material is sensitive to the synthetic conditions. Higher synthesis temperatures as well as the flame reaction technique followed by annealing gave more homogenous samples with higher Seebeck coefficient. IR optical spectroscopic measurements showed a wide range of doping level achieved among the different synthetic conditions. These findings suggest that synthetic conditions can act as a useful tool for the optimization of the thermoelectric properties of these materials.
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