| Autor: |
R F, Klie, Q, Qiao, T, Paulauskas, A, Gulec, A, Rebola, S, Öğüt, M P, Prange, J C, Idrobo, S T, Pantelides, S, Kolesnik, B, Dabrowski, M, Ozdemir, C, Boyraz, D, Mazumdar, A, Gupta |
| Rok vydání: |
2011 |
| Zdroj: |
Physical review letters. 108(19) |
| ISSN: |
1079-7114 |
| Popis: |
Ca3Co4O9 has a unique structure that leads to exceptionally high thermoelectric transport. Here we report the achievement of a 27% increase in the room-temperature in-plane Seebeck coefficient of Ca3Co4O9 thin films. We combine aberration-corrected Z-contrast imaging, atomic-column resolved electron energy-loss spectroscopy, and density-functional calculations to show that the increase is caused by stacking faults with Co4+-ions in a higher spin state compared to that of bulk Ca3Co4O9. The higher Seebeck coefficient makes the Ca3Co4O9 system suitable for many high temperature waste-heat-recovery applications. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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