Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 43, Issue 6, Pages 1983-1987Publisher
SPRINGER
DOI: 10.1007/s11664-013-2931-2
Keywords
Low thermal conductivity; thermoelectric; mineral-based compound; tetrahedrites
Categories
Funding
- Center for Revolutionary Materials for Solid State Energy Conversion, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001054]
Ask authors/readers for more resources
We present the study of the effect of Te substitution on the thermoelectric properties for Sb in Cu12Sb4-x Te (x) S-13 tetrahedrite compounds with x ranging from 0.2 to 1.5 in the temperature range of room temperature to 723 K. Powder x-ray diffraction and electron microscopy results indicate a successful homogenous substitution without the alteration of the crystal structure or the introduction of secondary phases. Thermoelectric property measurements show that the excess electrons from Te during the substitution fill the unoccupied levels near the top of the valence bands in pure Cu12Sb4S13 compound, moving the Fermi level closer to the top of the valence bands. This leads to an enhancement in thermopower but also to an increase in electrical resistivity. Overall, the reduction in total thermal conductivity gives rise to improved ZT values in all substituted samples. The highest ZT value obtained in this study is 0.92 at 723 K for x = 1, which is comparable to that of other p-type bulk thermoelectric materials.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available