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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Characterization of boroaluminosilicate glass surface structures by B K-edge NEXAFS
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Characterization of boroaluminosilicate glass surface structures by B K-edge NEXAFS

机译：B K-edge NEXAFS表征硼铝硅酸盐玻璃表面结构

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摘要

Techniques traditionally used to characterize bulk glass structure (NMR, IR, etc.) have improved significantly, but none provide direct measurement of local atomic coordination of glass surface species. Here, we used Near-Edge X-ray Absorption Fine Structure (NEXAFS) as a direct measure of atomic structure at multicomponent glass surfaces. Focusing on the local chemical structure of boron, we address technique-related issues of calibration, quantification, and interactions of the beam with the material. We demonstrate that beam-induced adsorption and structural damage can occur within the timeframe of typical measurements. The technique is then applied to the study of various fracture surfaces where it is shown that adsorption and reaction of water with boroaluminosilicate glass surfaces induces structural changes in the local coordination of boron, favoring B~(IV) species after reaction.
机译：传统上用于表征块状玻璃结构（NMR，IR等）的技术已得到显着改进，但没有一种技术可以直接测量玻璃表面物种的局部原子配位。在这里，我们使用近边缘X射线吸收精细结构（NEXAFS）作为多组分玻璃表面原子结构的直接量度。着眼于硼的局部化学结构，我们解决了与技术相关的标定，量化以及电子束与材料相互作用的问题。我们证明了束诱导的吸附和结构破坏可在典型测量的时间内发生。然后将该技术应用于各种断裂表面的研究，结果表明水与硼铝硅酸盐玻璃表面的吸附和反应会引起硼的局部配位结构改变，从而在反应后有利于B〜（IV）物种。

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