利用实验室x射线吸收光谱仪研究Fe - K-edge XANES形成物种的可行性

IF 1.1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Geosciences Pub Date : 2020-12-03 DOI:10.3190/jgeosci.299

L. Mottram, Samuel Cafferkey, Amber R. Mason, T. Oulton, Shiyin Sun, D. Bailey, M. Stennett, N. Hyatt

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引用次数: 9

摘要

通过分析铁k边XANES光谱的弱前边缘特征，我们证明了铁在模型化合物中的有效形态，使用商用实验室x射线光谱仪，使用球形弯曲晶体分析仪和低功率x射线管，在罗兰圆几何中。直接比较从第三代同步加速器弯曲磁体束线获得的XANES数据，使用相同的样品，验证了在确定总积分强度和前边缘特征质心位置方面的定量一致性，这是对吸收原子的电子构型和对称性的探测，因此氧化态和配位数。这项工作为实验室XANES快速和常规的铁形态研究打开了大门，即使是相对较稀的吸收剂浓度只有几个mol. %的材料。

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A feasibility investigation of speciation by Fe K-edge XANES using a laboratory X-ray absorption spectrometer

We demonstrate effective speciation of Fe in model compounds from analysis of the weak pre-edge features in Fe K-edge XANES spectra, with a commercially available laboratory X-ray spectrometer, using a spherically bent crystal analyser and a low-power X-ray tube, in Rowland circle geometry. Direct comparison with XANES data acquired from a third generation synchrotron bending magnet beamline, using the same specimens, validated quantitative agreement in determination of the total integrated intensity and centroid position of the pre-edge feature, which are a probe of the electronic configuration and symmetry of the absorber atom, and hence oxidation state and co-ordination number. This work opens the door to rapid and routine speciation studies of Fe by laboratory XANES, even for materials with relatively dilute absorber concentration of only a few mol. %.

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来源期刊

Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-MINERALOGY

CiteScore

2.30

自引率

7.10%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Geosciences is an international peer-reviewed journal published by the Czech Geological Society with support from the Czech Geological Survey. It accepts high-quality original research or review papers dealing with all aspects of the nature and origin of igneous and metamorphic rocks. The Journal focuses, mainly but not exclusively, on: -Process-oriented regional studies of igneous and metamorphic complexes- Research in structural geology and tectonics- Igneous and metamorphic petrology- Mineral chemistry and mineralogy- Major- and trace-element geochemistry, isotope geochemistry- Dating igneous activity and metamorphic events- Experimental petrology and mineralogy- Theoretical models of igneous and metamorphic processes- Mineralizing processes and mineral deposits. All the papers are written in English, even though they may be accompanied by an additional Czech abstract. Each contribution is a subject to peer review by at least two independent reviewers, typically at least one from abroad. The Journal appears 2 to 4 times a year. Formally it is divided in annual volumes, each of them including 4 issues.