通过扫描透射x射线显微镜在Mn L2,3边处定量绘制硅酸盐中Mn氧化还原态的纳米尺度图

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology Pub Date : 2025-03-11 DOI:10.1016/j.chemgeo.2025.122739

Franck Bourdelle , Cyril Durand , Erwan Paineau , Emily Lloret , Laura Airaghi

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引用次数: 0

摘要

我们提出了一种新的分析方案，用于在纳米尺度上定量和绘制硅酸盐中锰的氧化态。基于不同同步加速器设施的扫描透射x射线显微镜获得的Mn L2,3边（630-660 eV）的x射线吸收近边结构光谱，我们使用参考含锰样品校准两个方程，以精确确定Mn的均价。我们详细介绍了光谱处理和从提出的校准中获得定量Mn氧化还原图的方法，具有高空间分辨率（20-30 nm）。此外，我们探索了Mn和Fe L2耦合的潜力，在630-730 eV能量范围内进行3边氧化还原校准。通过两个案例研究评估了这些校准的有效性、MnFe结果的耦合以及随后的氧化还原映射，展示了这种非破坏性方法的好处。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Quantitative nanoscale mapping of the Mn redox states in silicates by scanning transmission X-ray microscopy at the Mn L2,3-edges

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Quantitative nanoscale mapping of the Mn redox states in silicates by scanning transmission X-ray microscopy at the Mn L2,3-edges

We present a novel analytical protocol for quantifying and mapping Mn oxidation states in silicates at the nanoscale. Based on X-ray Absorption Near Edge Structure spectra of the Mn L_2,3-edges (630–660 eV) acquired thanks to a Scanning transmission X-ray microscope available at various Synchrotron facilities, we calibrate two equations using reference Mn-bearing samples to precisely determine the Mn mean valence. We detail the spectra processing and the methodology for deriving quantitative Mn redox maps from the proposed calibrations, with a high spatial resolution (20–30 nm). Furthermore, we explore the potential for coupling Mn and Fe L_2,3-edge redox calibrations over the 630–730 eV energy range. The effectiveness of these calibrations, the coupling of MnFe results, and the subsequent redox mapping are evaluated through two case studies, showcasing the benefits of this non-destructive approach.

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来源期刊

Chemical Geology 地学-地球化学与地球物理

CiteScore

7.20

自引率

10.30%

发文量

374

审稿时长

3.6 months

期刊介绍： Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.