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Confocal depth-resolved micro-X-ray absorption spectroscopy study of chemically strengthened boroaluminosilicate glasses

机译：化学加强的硼铝硅酸盐玻璃的共聚焦深度分辨的微X射线吸收光谱研究

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摘要

It is crucial to understand the structural origins of macroscopic properties in silicate glasses for their high-tech applications. An example of such an application is chemically strengthened boroaluminosilicate glasses that are exposed to an ion exchange process during which alkali ions ( e.g. Na ~(+) ) are replaced by larger ( e.g. K ~(+) ) ions. Despite the empirically thorough understanding of this exchange process, much less is known about the fundamental physics of the process. Since Fe atoms are a suitable probe for monitoring chemical stress-induced changes in the local structure in the chemically strengthened glasses, a set of chemically strengthened boroaluminosilicate glasses containing 1 mol% Fe _(2) O _(3) are here studied using depth-resolved confocal X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectroscopy. Information on the Fe oxidation state, coordination number, and bond distance as a function of the sample depth and glass composition is obtained. These new insights on chemical stress-induced changes will aid in the further development and improvement of such damage-resistant glasses.
机译：了解硅酸盐玻璃中宏观性质的结构起源至关重要的是其高科技应用。这种施用的实例是化学加强的硼铝硅酸盐玻璃，其暴露于离子交换过程中，在此期间碱性离子（例如Na〜（+））较大（例如K〜（+））离子。尽管对这种交流过程的经验彻底了解，但关于该过程的基本物理知之甚少。由于Fe原子是用于监测化学增强的眼镜中局部结构中的化学应激诱导的变化的合适探针，因此这里使用深度研究了一组含有1mol％Fe _（2）O _（3）的化学加强的硼铝硅酸盐玻璃 - 溶解的共聚焦X射线吸收近边缘结构（XANES）和延伸的X射线吸收细结构（EXAFS）光谱。获得有关Fe氧化状态，配位数和作为样品深度和玻璃组合物的函数的键合距离。这些新的洞察化学胁迫引起的变化将有助于进一步发展和改进这种抗损害眼镜。

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