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首页> 外文期刊>American Mineralogist >Fe site occupancy in magnetite-ulvospinel solid solutions: A new approach using X-ray magnetic circular dichroism
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Fe site occupancy in magnetite-ulvospinel solid solutions: A new approach using X-ray magnetic circular dichroism

机译：磁铁矿-ulspinepinel固溶体中的铁位点占据：一种使用X射线磁性圆二色性的新方法

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摘要

Ordering of Fe3+ and Fe2+ cations between octahedral and tetrahedral sites in synthetic members of the magnetite-ulvöspinel (Fe3O4-Fe2TiO4) solid-solution series was determined using Fe L2,3-edge X-ray magnetic circular dichroism (XMCD) coupled with electron microprobe and chemical analysis, Ti L2,3-edge and Fe K-edge X-ray absorption spectroscopy (XAS), and unit-cell parameters. Microprobe analyses, cell edges, and chemical FeO determinations showed that bulk compositions were stoichiometric magnetite-ulvöspinel solid solutions. XMCD showed that the surface was sensitive to redox conditions, and samples required re-equilibration with solid-solid buffers. Detailed site-occupancy analysis gave Fe2+/Fe3+ XMCD-intensity ratios close to stoichiometric values.
机译：磁铁矿-ulvöspinel 位置之间的Fe 3 + 和Fe 2 + 阳离子的顺序> Fe（sup> 3 3 O 4 -Fe 2 TiO 4 ）固溶系列> L 2,3 -边缘X射线磁性圆二色性（XMCD）结合 电子微探针和化学分析，Ti L 2,3 -edge和 Fe K-edge X射线吸收光谱（XAS），以及晶胞 参数。显微探针分析，细胞边缘和化学FeO 测定表明，大块成分是化学计量的<磁铁>磁铁矿-固溶体。 XMCD显示 表面对氧化还原条件敏感，并且样品需要 用固-固缓冲液重新平衡。详细的站点占用 分析得出Fe 2 + / Fe 3 + XMCD强度比接近化学计量值 。

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  • 来源
    《American Mineralogist》 |2010年第4期|425-439|共15页
  • 作者

    Carolyn I. Pearce; C. Michael B. Henderson; Neil D. Telling; Richard A.D. Pattrick; John M. Charnock; Victoria S. Coker; Elke Arenholz; Floriana Tuna; Gerrit van der Laan;

  • 作者单位

    School of Earth, Atmospheric and Environmental Sciences and Williamson Research Center for Molecular Environmental Science, University of Manchester, Manchester M13 9PL, U.K.;

    School of Earth, Atmospheric and Environmental Sciences and Williamson Research Center for Molecular Environmental Science, University of Manchester, Manchester M13 9PL, U.K.|Science and Technology Funding Council Daresbury Laboratory, Warrington WA4 4AD, U.K.;

    School of Earth, Atmospheric and Environmental Sciences and Williamson Research Center for Molecular Environmental Science, University of Manchester, Manchester M13 9PL, U.K.;

    School of Earth, Atmospheric and Environmental Sciences and Williamson Research Center for Molecular Environmental Science, University of Manchester, Manchester M13 9PL, U.K.;

    School of Earth, Atmospheric and Environmental Sciences and Williamson Research Center for Molecular Environmental Science, University of Manchester, Manchester M13 9PL, U.K.;

    School of Earth, Atmospheric and Environmental Sciences and Williamson Research Center for Molecular Environmental Science, University of Manchester, Manchester M13 9PL, U.K.;

    Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, U.S.A.;

    School of Chemistry, University of Manchester, Manchester, M13 9PL, U.K.;

    School of Earth, Atmospheric and Environmental Sciences and Williamson Research Center for Molecular Environmental Science, University of Manchester, Manchester M13 9PL, U.K.|Diamond Light Source, Chilton, Didcot OX11 0DE, U.K.;

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