Nanoscale spatial analysis of clay minerals containing cesium by synchrotron radiation photoemission electron microscopy
Nanoscale spatial analysis of clay minerals containing cesium by synchrotron radiation photoemission electron microscopy
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DOI：
10.1063/1.5005799
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发表时间：
2018-01
影响因子：
4
通讯作者：
A. Yoshigoe;H. Shiwaku;Toru Kobayashi;I. Shimoyama;D. Matsumura;T. Tsuji;Y. Nishihata;T. Kogure;T. Ohkochi;A. Yasui;T. Yaita
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作者：
A. Yoshigoe;H. Shiwaku;Toru Kobayashi;I. Shimoyama;D. Matsumura;T. Tsuji;Y. Nishihata;T. Kogure;T. Ohkochi;A. Yasui;T. Yaita
利用同步辐射光电子显微镜（SR-PEEM）对人工吸附铯原子的微米级风化黑云母粘土颗粒进行了精确分析。尽管粘土的绝缘性能，我们观察到的组成元素（Si，Al，Cs，Mg和Fe）的空间分布没有充电的问题，并澄清这些元素之间的相互位置相关性与纳米分辨率。我们发现，铯原子可能被均匀吸附在整个颗粒，但是，我们确定了一个职业之间的冲突，铯和镁原子，这意味着铯吸附涉及离子交换过程。空间分辨的X射线吸收光谱（XAS）的Cs 4，5 M-边缘区域显示Cs是目前在一价态（Cs+），通常观察到的Cs化合物。还在Fe L2，3-边缘处进行了进一步的精确XAS测量以确定Fe原子的化学价。光谱的形状与实验结果相似。
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 Cs4,5 M-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 thos...