Praseodymium Telluride: A High-Temperature, High-ZT Thermoelectric Material
| Autor: | Bruce Dunn, Jean-Pierre Fleurial, David M. Smiadak, Brea E. Hogan, Paul von Allmen, Kathleen Lee, Dean Cheikh, Alexandra Zevalkink, Trinh Vo, Sabah K. Bux |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Condensed matter physics Praseodymium Fermi level chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Thermoelectric materials 01 natural sciences 0104 chemical sciences symbols.namesake chemistry.chemical_compound General Energy Effective mass (solid-state physics) chemistry Seebeck coefficient Telluride Thermoelectric effect symbols Density of states 0210 nano-technology |
| Zdroj: | Joule. 2:698-709 |
| ISSN: | 2542-4351 |
| DOI: | 10.1016/j.joule.2018.01.013 |
| Popis: | Summary Refractory rare-earth tellurides with the Th 3 P 4 structure type have attracted considerable interest as high-performance thermoelectric materials since the 1980s due to their high dimensionless figure of merit ( ZT ). Extensive work has been conducted on La 3−x Te 4 with peak ZT values greater than 1.1 at 1,273 K. The high ZT of La 3-x Te 4 is in part due to a large peak in the density of states near the Fermi level from the La 5d states. Here, we revisit Pr 3−x Te 4 , for which our electronic structure calculations predict a favorable modification of the density of states by the introduction of praseodymium's 4f electrons. This was experimentally verified by preparing Pr 3−x Te 4 samples with varying Pr vacancy concentrations using a mechanochemical synthesis approach. The thermoelectric properties were measured and a ZT of 1.7 at 1,200 K was achieved with Pr 2.74 Te 4 . The 50% improvement in peak ZT compared with La 3−x Te 4 resulted from an increased effective mass, improved Seebeck coefficient, and lower thermal conductivity. |
| Databáze: | OpenAIRE |
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