Quick Fabrication and Thermoelectric Properties of Doped Tetrahedrites
In this paper, the effect of annealing time on the microstructure and thermoelectric properties of Cu11.5Mn0.5Sb4S13 tetrahedrite was studied, hoping to shorten the fabrication time of bulk doped tetrahedrites. The results show that Cu11.5Mn0.5Sb4S13 tetrahedrite phase formed in the melt during cooling. The ingot consisted of principal phase of Cu11.5Mn0.5Sb4S13 and secondary phases of Cu3SbS4, Cu2S and CuSbS2. Long time annealing could not eliminate the Cu3SbS4 and CuSbS2 phases in Cu11.5Mn0.5Sb4S13 tetrahedrite. Sintering could eliminate Cu2S phase. Long time annealing had slight effect on electrical resistivity, and negligible effect on Seebeck coefficient and thermal conductivity of Cu11.5Mn0.5Sb4S13 tetrahedrite. All the Cu11.5Mn0.5Sb4S13 samples had ZT in excess of 0.6 at above 650 K and the maximum ZT value obtained in this study was 0.74 for the un-annealed sample. Cobalt doped tetrahedrite Cu11.5Co0.5Sb4S13 fabricated by the un-annealed process could also obtain a ZT value of ~0.7. Based on the experimental results, the time for preparing doped tetrahedrites can be cut considerably.
KeywordsCu11.5Mn0.5Sb4s13 tetrahedrite Annealing Microstructure Thermoelectric properties
This work is financially supported by Natural Science Foundation of China (51372261).
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