Thermoelectric Properties of Mn Doped Cu_12-xMn_xSb₄S₁₃ Tetrahedrites

Abstract:

In this study, Mn doped Cu_12-xMn_xSb₄S₁₃(x=0, 0.5, 1.0, and 2.0) tetrahedrite samples were prepared by melting and annealing followed by hot press sintering. Powder X-ray diffraction and scanning electron microscopy and electron energy dispersive spectroscopy analysis were performed for the samples, and the thermoelectric transport properties of samples were characterized. The experimental results showed that the synthetic tetrahedrites were consisted of principal Cu₁₂Sb₄S₁₃ phase and a small amount of secondary Cu₃SbS₄ and CuSbS₂. The electrical conductivity of the tetrahedrites decreased with increasing the Mn doping amount. Contrary to the electrical conductivity, the Seebeck coefficient of the tetrahedrites increased with increasing Mn doping amount. The thermal conductivity decreased with increasing Mn doping amount due to the suppression of the carrier contribution, as well as due to the substitution effect of Mn on the Cu site. For the Mn doped Cu_12-xMn_xSb₄S₁₃ compounds with x=0.5, 1.0, and 2.0, the ZT values decreased with the increase of Mn doping amount, a maximum ZT=0.89 was obtained for the Mn doped compound with x=0.5.

• Periodical: Materials Science Forum (Volume 847)
• Pages: 161-165
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.847.161
• Online since: March 2016
• Authors: Ju Yi Wang, Xiao Ya Li, Ye Feng Bao
• Keywords: Cu₁₂Sb₄S₁₃ Tetrahedrite, Mn Doping, Thermoelectric Properties

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