Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 769, Issue -, Pages 478-483Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.07.335
Keywords
Tetrahedrite Cu12Sb4S13; Thermoelectric performance; Seebeck coefficient; Thermal conductivity; Rietveld refinements
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Funding
- Natural Science Foundation of China [51672278, 11674322, 11464048]
- AnHui Provincial Natural Science Foundation [1608085MA17]
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Pb-doped tetrahedrite Cu12-xPbxSb4S13 (x = 0, 0.25, 0.50, 0.75, 1.00, 1.25 and 1.50) samples were prepared and their thermoelectric properties were investigated in the temperature range from 300 K to 723 K. The results show that Pb is successfully doped in Cu(1) site, which brings about both 10-118% increase in Seebeck coefficient owing to the decrease of hole concentration and 87-168% decrease in thermal conductivity due to the enhanced phonon scattering by the dopant atoms. As a result, a maximum ZT = 0.8 at 723 K is achieved for Cu11PbSb4S13, which is similar to 43% larger than that of pristine Cu12Sb4S13. Present results demonstrate that Pb is an effective dopant to elevate thermoelectric performance of Cu12Sb4S13. (C) 2018 Elsevier B.V. All rights reserved.
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