English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 57623/91160 (63%)
造訪人次 : 13560971      線上人數 : 57
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/987654321/96247


    題名: Towards understanding the electronic structure of Fe-doped CeO2 nanoparticles with X-ray spectroscopy
    作者: Wang, Wei-Cheng;Chen, Shih-Yun;Glans, Per-Anders;Guo, Jinghua;Chen, Ren-Jie;Fong, Kang-Wei;Chen, Chi-Liang;Gloter, Alexandre;Chang, Ching-Lin;Chan, Ting-Shan;Chen, Jin-Ming;Lee, Jyh-Fu;Dong, Chung-Li
    貢獻者: 淡江大學物理學系
    日期: 2013
    上傳時間: 2014-03-06 16:47:20 (UTC+8)
    出版者: Cambridge: Physical Chemistry Chemical Physics
    摘要: This study reports on the electronic structure of Fe-doped CeO2 nanoparticles (NPs), determined by coupled X-ray absorption spectroscopy and X-ray emission spectroscopy. A comparison of the local electronic structure around the Ce site with that around the Fe site indicates that the Fe substitutes for the Ce. The oxygen K-edge spectra that originated from the hybridization between cerium 4f and oxygen 2p states are sensitive to the oxidation state and depend strongly on the concentration of Fe doping. The Ce M4,5-edges and the Fe L2,3-edges reveal the variations of the charge states of Ce and Fe upon doping, respectively. The band gap is further obtained from the combined absorption–emission spectrum and decreased upon Fe doping, implying Fe doping introduces vacancies. The oxygen vacancies are induced by Fe doping and the spectrum reveals the charge transfer between Fe and Ce. Fe3+ doping has two major effects on the formation of ferromagnetism in CeO2 nanoparticles. The first, at an Fe content of below 5%, is that the formation of Fe3+–Vo–Ce3+ introduces oxygen deficiencies favoring ferromagnetism. The other, at an Fe content of over 5%, is the formation of Fe3+–Vo–Fe3+, which favors antiferromagnetism, reducing the Ms. The defect structures Fe3+–Vo–Ce3+ and Fe3+–Vo–Fe3+ are crucial to the magnetism in these NPs and the change in Ms can be described as the effect of competitive interactions of magnetic polarons and paired ions.
    關聯: Physical Chemistry Chemical Physics 15(35), pp.14701-14707
    DOI: 10.1039/C3CP52054D
    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
    1463-9076_15(35)p14701-14707.pdf1862KbAdobe PDF467檢視/開啟
    index.html0KbHTML186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