复杂的--酸盐玻璃中的:对化学环境和结构的洞察
John S McCloy1,2, Natalie Smith-Gray2, John M Bussey1
1School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States.
Inorganic chemistry
|February 23, 2024
概括
在酸盐玻璃中的结合影响了各种技术领域. 这项研究揭示了如何影响性-酸玻璃结构,在较高度下识别出不同的位和结晶行为.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 地质化学 地质化学
背景情况:
- 在酸盐玻璃中加入对于地质物理学,金,牙科,光学和废物管理的应用至关重要.
- 了解的结构作用是调整玻璃性能以满足特定技术需求的关键.
研究的目的:
- 为了研究性-酸盐玻璃中含量增加的结构影响.
- 为了确定玻璃矩阵内的的协调环境和潜在结晶路径.
主要方法:
- 合成的性酸玻璃含有高达25mol%的.
- 采用X射线衍射 (XRD),27Al和19F神奇角度旋转核磁共振 (MAS NMR) 光谱,以及电子探针微分析进行表征.
主要成果:
- 所有的都被保留在玻璃中,直到临界度.
- 过剩的 (>12-15 mol%) 分为CaF2,NaF和Na-Al-F结晶相.
- 在玻璃中确定了五个不同的位,其中两个持久的玻璃状位可能涉及Al-F-Ca/Na结构.
结论:
- 的结合影响了性-酸玻璃的结构,导致相位分离和结晶在更高的度.
- 确定玻璃内部存在特定的协调环境.
- 提供了关于预测F NMR化学转移在相关的多组件系统的见解.
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