在酸玻璃中铁的物种化和协调
Laurent Cormier1, Gérald Lelong1, Daniel R Neuville2
1Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, IRD, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, cc115, 4 place Jussieu, 75005 Paris, France.
The Journal of chemical physics
|August 1, 2025
概括
这项研究表明,酸玻璃中的铁主要是Fe3+. 增加的氧化 (Li2O) 会改变光学吸收边缘,并改变酸盐网络结构.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 玻璃科学 玻璃科学
背景情况:
- 酸玻璃是一种具有调节性质的多功能材料.
- 了解像铁这样的过渡金属离子的作用对于开发新的玻璃应用至关重要.
- 这些玻璃中的铁的协调状态和网络相互作用尚未完全理解.
研究的目的:
- 为了研究氧化物 (Li2O) 含量和铁氧化物 (Fe2O3) 添加在酸盐玻璃上的影响.
- 描述这些修饰玻璃的物理,光学和结构性质.
- 为了确定玻璃矩阵内的铁离子的氧化状态和协调环境.
主要方法:
- 光学吸收光谱分析电子转换和吸收边缘移动.
- 边缘结构附近的X射线吸收 (XANES) 来识别铁的氧化状态 (Fe2+与Fe3+).
- 射线吸收光谱 (XAS) 用于确定Fe3+离子的协调数和局部环境.
- 拉曼光谱检测酸盐网络结构和连接性的变化.
主要成果:
- 在研究的玻璃中,铁主要以Fe3+的形式存在,检测到的Fe2+最小.
- 观察到光学吸收边缘的蓝色转移与增加的Li2O含量有关,与BO3转化为BO4单位有关.
- 发现Fe3+离子主要在四面体协调中,在较低的Li2O度下,协调数增加.
- 拉曼光谱表明Fe3+破坏酸盐网络,与原子形成新的联系,特别是在四面体位点.
结论:
- 2O含量显著影响酸玻璃的结构演变,促进BO4单元的形成.
- 铁,作为Fe3+,集成到玻璃网络中,采用四面体协调并影响网络连接.
- 这些发现提供了铁玻璃酸玻璃的结构性质关系的见解,这与光学和材料应用有关.
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