Phase Stability, Crystal Structure, and Thermoelectric Properties of Cu12Sb4S13–xSex Solid Solutions
- Chongqing Univ. (China); Michigan State Univ., East Lansing, MI (United States)
- Michigan State Univ., East Lansing, MI (United States)
- Univ. of California, Los Angeles, CA (United States)
The solubility of selenium on the sulfur site in tetrahedrite Cu12Sb4S13 has been explored by theoretical calculations here, and the results have been verified by X-ray diffraction and X-ray synchrotron studies on Cu12Sb4S13–xSex with x ranging from zero to 3. Density-functional theory calculations predict that Se substitution on the tetrahedral 24g site is preferred, and this is found to be consistent with Rietveld refinement of the crystal structure. High temperature thermoelectric property measurements on Cu12Sb4S13-xSex reveal that Se substitution results in a decrease in electrical resistivity without diminution of the Seebeck coefficient. The “decoupling” of these parameters leads to a 30% enhancement in power factor of the x = 1 sample compared to that of pure Cu12Sb4S13. Furthermore, in spite of an increased electronic thermal conductivity, alloy scattering of phonons caused by Se substitution reduces both the lattice and total thermal conductivities, leading to a large increase in the thermoelectric figure of merit.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Revolutionary Materials for Solid State Energy Conversion (RMSSEC)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0001054; AC02-06CH11357; AC02-05CH11231
- OSTI ID:
- 1370337
- Journal Information:
- Chemistry of Materials, Vol. 28, Issue 6; Related Information: RMSSEC partners with Michigan State University (lead); University of California, Los Angeles; University of Michigan; Northwestern University; Oak Ridge National Laboratory; Ohio State University; Wayne State University; ISSN 0897-4756
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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