在压力下的无形酸中,协调环境的转变和网络聚合在无形酸中
Lawrence V D Gammond1, Anita Zeidler1, Randall E Youngman2
1Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom.
The Journal of chemical physics
|August 16, 2024
概括
高压将协调转化为酸玻璃,改变它们的结构. 这种转变,特别是六坐标的形成,与永久的密集化和网络连接变化有关.
科学领域:
- 材料科学 材料科学 材料科学
- 地质化学 地质化学
- 固态化学 固态化学
背景情况:
- 氧化玻璃在材料科学和地质学中至关重要.
- 了解它们对压力的结构反应是控制材料特性和地质过程的关键.
- 以前的研究表明,压力诱导的结构变化,但详细的机制仍然不清楚.
研究的目的:
- 为了研究氨酸玻璃中压力诱导的结构变化.
- 阐明协调的变化及其与密度化之间的关系.
- 开发一种自相一致的模型,用于这些玻璃的压力诱导的结构演变.
主要方法:
- 在现场高压中子衍射.
- 27Al核磁共振 (NMR) 光谱学. 在27Al核磁共振 (NMR) 光谱学.
- 对氧包装分数和减少密度 (ρ') 的分析.
主要成果:
- 确定了三种不同的压力模式,用于从四面体到八面体的协调转换.
- 的特异表现出一种常见的依赖于减少密度 (ρ') 在密集的酸中.
- 六坐标 (Al(VI)) 种的形成迅速增加,超过了减少密度值 (ρ'thr ≈ 1.1).
- 网络连接性发生变化,消耗非桥接氧气,形成桥接氧气或三,取决于网络脱聚合.
结论:
- 提出了一个自我一致的模型,用于压力诱导的结构变化酸玻璃.
- 和氧气包装分量的协调是结构变化和密集化的关键指标.
- 六坐标 (Al(VI)) 作为网络修饰器或前者的作用在压力诱导的结构演变中很重要.
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