政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/76101
English  |  正體中文  |  简体中文  |  Post-Print筆數 : 27 |  全文笔数/总笔数 : 94188/124659 (76%)
造访人次 : 29673435      在线人数 : 399
RC Version 6.0 © Powered By DSPACE, MIT. Enhanced by NTU 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


    请使用永久网址来引用或连结此文件: http://nccur.lib.nccu.edu.tw/handle/140.119/76101


    题名: Magnetism in nanoparticles of semiconducting FeSi2
    作者: Hamdeh, H.H.;Eltabey, M.M.;Ho, J.C.;Lee, P.C.;Chen, K.;Chen, Yang-Yuan
    陳洋元
    贡献者: 應物所
    关键词: Chemical disorder;Compositional heterogeneity;Fe-ions;Iron disilicide;Low temperatures;Magnetic ordering;Magnetic orders;Magnetic studies;Quadrupoles;Shift parameters;Sommerfeld constant;XRD;Calorimetry;Iron compounds;Molybdenum;Nanoparticles;Specific heat;Spin glass;Superparamagnetism;Nanomagnetics
    日期: 2010-08
    上传时间: 2015-06-29 17:21:41 (UTC+8)
    摘要: Iron disilicide has been found to exhibit superparamagnetism in nanoparticles, even though no magnetic ordering occurs in bulk. The unexpected behavior was attributed, based on magnetic studies, to chemical disorder. A lack of sextet-type signals in Mössbauer spectra supports that the observed magnetic order is confined to only a very small fraction of magnetic Fe ions. Moreover, quadrupole-splitting and isomer-shift parameters reveal a significant amount of Fe in a short-range α-FeSi2 structure, while XRD suggests an overall β-FeSi2 structure. Such a compositional heterogeneity is also reflected in a calorimetrically obtained spin-glass-like anomaly at low temperatures. Meanwhile, as the particle size decreases, specific heat and Sommerfeld constant are enhanced due to lattice softening and the emergence of surface charge density of states, respectively, in nanoparticles. © 2010 Elsevier B.V. All rights reserved.
    關聯: Journal of Magnetism and Magnetic Materials, 322(15), 2227-2230
    数据类型: article
    DOI 連結: http://dx.doi.org/10.1016/j.jmmm.2010.02.015
    DOI: 10.1016/j.jmmm.2010.02.015
    显示于类别:[應用物理研究所 ] 期刊論文

    文件中的档案:

    档案 描述 大小格式浏览次数
    2227-2230.pdf481KbAdobe PDF539检视/开启


    在政大典藏中所有的数据项都受到原著作权保护.


    社群 sharing

    著作權政策宣告
    1.本網站之數位內容為國立政治大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,惟仍請適度,合理使用本網站之內容,以尊重著作權人之權益。商業上之利用,則請先取得著作權人之授權。
    2.本網站之製作,已盡力防止侵害著作權人之權益,如仍發現本網站之數位內容有侵害著作權人權益情事者,請權利人通知本網站維護人員(nccur@nccu.edu.tw),維護人員將立即採取移除該數位著作等補救措施。
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈