| Effect of local atomic and electronic structures on thermoelectric properties of chemically substituted CoSi | |
|---|---|
| 學年 | 102 |
| 學期 | 2 |
| 出版（發表）日期 | 2014-05-01 |
| 作品名稱 | Effect of local atomic and electronic structures on thermoelectric properties of chemically substituted CoSi |
| 作品名稱（其他語言） | |
| 著者 | Hsu, C. C.; Pao, C. W.; Chen, J. L.; Chen, C. L.; Dong, C. L.; Liu, Y. S.; Lee, J. F.; Chan, T. S.; Chang, C. L.; Kuo, Y. K.; Lue, C. S. |
| 單位 | 淡江大學物理學系 |
| 出版者 | Les Ulis: E D P Sciences |
| 著錄名稱、卷期、頁數 | Europhysics Letters 106(3), 37007(6pages) |
| 摘要 | We report the effects of Ge partial substitution for Si on local atomic and electronic structures of thermoelectric materials in binary compound cobalt monosilicides (CoSi1−xGex: 0 ≤ x ≤ 0.15). Correlations between local atomic/electronic structure and thermoelectric properties are investigated by means of X-ray absorption spectroscopy. The spectroscopic results indicate
 that as Ge is partially substituted onto Si sites at x ≤ 0.05, Co in CoSi1−xGex gains a certain amount of charge in its 3d orbitals. Contrarily, upon further replacing Si with Ge at x ≥ 0.05, the Co 3d orbitals start to lose some of their charge. Notably, thermopower is strongly correlated with charge redistribution in the Co 3d orbital, and the observed charge transfer between Ge and Co is responsible for the variation of Co 3d occupancy number. In addition to Seebeck coefficient, which can be modified by tailoring the Co 3d states, local lattice disorder may also be beneficial in enhancing the thermoelectric properties. Extended X-ray absorption fine structure spectrum results further demonstrate that the lattice phonons can be enhanced by Ge doping, which results in the formation of the disordered Co-Co pair. Improvements in the thermoelectric properties are interpreted based on the variation of local atomic and electronic structure induced by lattice distortion through chemical substitution. |
| 關鍵字 | |
| 語言 | en |
| ISSN | 0295-5075 1286-4854 |
| 期刊性質 | 國外 |
| 收錄於 | SCI |
| 產學合作 | |
| 通訊作者 | |
| 審稿制度 | |
| 國別 | FRA |
| 公開徵稿 | |
| 出版型式 | 電子版 紙本 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/98558 ) |
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