論文

査読有り
2018年1月8日

Nanoscale spatial analysis of clay minerals containing cesium by synchrotron radiation photoemission electron microscopy

Applied Physics Letters
  • Akitaka Yoshigoe
  • ,
  • Hideaki Shiwaku
  • ,
  • Toru Kobayashi
  • ,
  • Iwao Shimoyama
  • ,
  • Daiju Matsumura
  • ,
  • Takuya Tsuji
  • ,
  • Yasuo Nishihata
  • ,
  • Toshihiro Kogure
  • ,
  • Takuo Ohkochi
  • ,
  • Akira Yasui
  • ,
  • Tsuyoshi Yaita

112
2
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1063/1.5005799
出版者・発行元
American Institute of Physics Inc.

A synchrotron radiation photoemission electron microscope (SR-PEEM) was applied to demonstrate the pinpoint analysis of micrometer-sized weathered biotite clay particles with artificially adsorbed cesium (Cs) atoms. Despite the insulating properties of the clay, we observed the spatial distributions of constituent elements (Si, Al, Cs, Mg, and Fe) without charging issues and clarified reciprocal site-correlations among these elements with nanometer resolution. We found that Cs atoms were likely to be adsorbed evenly over the entire particle
however, we identified an occupational conflict between Cs and Mg atoms, implying that Cs sorption involves ion exchange processes. Spatially resolved X-ray absorption spectra (XAS) of the Cs4,5M-edge region showed Cs to be present in a monocation state (Cs+) as typically observed for Cs compounds. Further pinpoint XAS measurements were also performed at the Fe L2,3-edge to determine the chemical valence of the Fe atoms. The shapes of the spectra were similar to those for Fe2O3, indicating that Fe in the clay was in a 3+ oxidation state. From these observations, we infer that charge compensation facilitates Cs adsorption in the vicinity of a substitution site where Si4+ ions are replaced by Fe3+ ions in SiO4 tetrahedral sheets. Our results demonstrate the utility of SR-PEEM as a tool for spatially resolved chemical analyses of various environmental substances, which is not limited by the poor conductivity of samples.

Web of Science ® 被引用回数 : 2

リンク情報
DOI
https://doi.org/10.1063/1.5005799
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000422965000012&DestApp=WOS_CPL

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