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Development of thermoelectric materials based on iron-sulfide minerals is reviewed with focusing on n-type doped CuFeS2. It is found that the thermoelectric properties of Zn-doped CuFeS2 strongly depend on the synthesis method, especially on the cooling rate and heat treatment conditions after spark-plasma sintering (SPS). A high power factor exceeding 1 mW/Km is achieved around room temperature for samples annealed and slowly cooled after SPS. With aiming at reducing thermal conductivity, several methods are applied including the high-pressure torsion technique and nano-structuring by ball milling. These experiments successfully yield reduced thermal conductivity, though experimental conditions needs to be optimized to reduce electrical resistivity simultaneously.

Development of Thermoelectric Materials Based on Iron Sulfide Minerals