淡江大學機構典藏:Item 987654321/51778
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 64191/96979 (66%)
造访人次 : 8201874      在线人数 : 7485
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜寻范围 查询小技巧：
  • 您可在西文检索词汇前后加上"双引号"，以获取较精准的检索结果
  • 若欲以作者姓名搜寻，建议至进阶搜寻限定作者字段，可获得较完整数据
    •  进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/51778


    题名: 以X光吸收光譜研究FeSi2奈米粒子的電子結構
    其它题名: The electronic structure of FeSi2 nanoparticles studied by X ray absorption spectroscopy
    作者: 許哲恩;Hsu, Che-en
    贡献者: 淡江大學物理學系碩士班
    張經霖;Chang, Ching-lin
    关键词: X光吸收光譜近邊結構;FeSi;磁性;XANES;magnetic
    日期: 2010
    上传时间: 2010-09-23 16:05:03 (UTC+8)
    摘要: 我們運用X光吸收光譜近邊結構(XANES)研究β-FeSi2奈米粒子之尺寸與其電子結構及物理性質之相關性。在Fe K-edge光譜上觀察到奈米尺寸樣品的Fe 4p未佔據態相較於塊材明顯增加且主吸收峰的位置向低能量位移大約4.5 eV。在較低能量，距主峰約20 eV處有個強度較弱的峰為Fe 3d-Fe 4p混成軌域的貢獻，此峰的強度隨著尺寸減小有減弱的趨勢顯示Fe 3d-Fe 4p混成程度隨著尺寸減小而減少。在Fe L2,3-edge光譜觀察到Fe 3d未佔據態隨著尺寸減小而增加。在較高能量，距離主峰1.7 eV有個強度較弱峰為Fe 3d-Si 3p混成軌域的貢獻，此峰的強度隨著尺寸減小有減弱的趨勢顯示Fe 3d-Si 3p混成程度隨著尺寸減小而減少。在Si K-edge光譜上觀察隨著尺寸減小氧化矽明顯增加。我們推論β-FeSi2奈米粒子的磁性與奈米微粒內之Fe群聚有關。
    We have performed x-ray absorption near edge structure (XANES) on β-FeSi2 nanoparticles to study the correlations between the particle size and their physical properties. Fe K-edge spectra indicates that the number of Fe 4p unoccupied states of nanoparticle samples are higher compared with the bulk sample. The main peak shifted 4.5 eV to the lower energy site. The small feature, contributed by Fe 3d-Fe 4p hybridized states at (~ 7115 eV), decreases as the samples size is decreased, which suggests that Fe 3d-Fe 4p hybridization decreases as the samples size is decreased. Fe L2,3-edge spectra indicates that Fe 3d unoccupied states increases as the samples size is decreased. The intensity of a small shoulder at about 1.7 eV to the higher energy site contributed by Fe 3d-Si 3p hybridized states, decreases as the samples size is decreased, suggesting that Fe 3d-Si 3p hybridization decreases as the samples size is decreased. Si K-edge spectra indicates that the silicon oxidation increases as the samples size is decreased. We conclude that the magnetic property of β-FeSi2 nanoparticles is related to the isolated Fe inside the particles.
    显示于类别:[物理學系暨研究所] 學位論文

    文件中的档案:

    档案 大小格式浏览次数
    index.html0KbHTML313检视/开启

    在機構典藏中所有的数据项都受到原著作权保护.

    TAIR相关文章

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