English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 51510/86705 (59%)
造訪人次 : 8270678      線上人數 : 136
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋
    請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/98558


    題名: Effect of local atomic and electronic structures on thermoelectric properties of chemically substituted CoSi
    作者: 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.
    貢獻者: 淡江大學物理學系
    日期: 2014-05
    上傳時間: 2014-08-13 10:04:48 (UTC+8)
    出版者: Les Ulis: E D P Sciences
    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.
    關聯: Europhysics Letters 106(3), 37007(6pages)
    DOI: 10.1209/0295-5075/106/37007
    顯示於類別:[物理學系暨研究所] 期刊論文

    文件中的檔案:

    檔案 描述 大小格式瀏覽次數
    0295-5075_106_3_37007.pdf838KbAdobe PDF374檢視/開啟
    index.html0KbHTML159檢視/開啟

    在機構典藏中所有的資料項目都受到原著作權保護.

    TAIR相關文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回饋