铁的氧化还原作用对酸盐玻璃的结构和粘度和化玻璃的影响
Sohei Sukenaga1,2, Maria Rita Cicconi2,3, Hiroki Yamada4
1Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, 980-8577 Sendai, Japan.
The Journal of chemical physics
|December 24, 2024
概括
酸盐融的粘度随着较高的铁对总铁的比率而显著增加. 这一发现澄清了铁的含量.
科学领域:
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
背景情况:
- 酸溶液的粘度对于岩系统和材料加工至关重要.
- 铁离子对融粘度的影响是复杂的,因为它们的双氧化还原状态 (Fe3+和Fe2+).
- 了解铁的作用是预测各种条件下的融化行为的关键.
研究的目的:
- 为了阐明铁--酸盐融的粘度,在一系列的铁氧化还原状态.
- 研究铁氧化还原比 (Fe3+/Fetot) 对融化粘度在玻璃过渡温度 (Tg) 附近的影响.
- 为了将结构变化与粘度变化的相关性作为铁氧化还原状态的函数.
主要方法:
- 合成铁--酸盐玻璃与控制的铁氧化还原状态.
- 在玻璃过渡温度 (Tg) 附近的粘度测量.
- 使用X射线吸收接近边缘结构 (XANES) 光谱,拉曼光谱,同步射线X射线总散射和密度测量进行了表征.
主要成果:
- 融的粘度随着Fe3+/Fetot比率的增加而增加了超过四个数量级.
- 粘度的温度依赖性在Tg附近的Fe3+/Fetot比率较高的玻璃中更为明显.
- 结构分析表明Fe3+充当网络前体,而Fe2+充当网络修饰体.
结论:
- 铁的氧化还原状态显著控制了酸融化的粘度.
- 加入Fe3+加强了融结构,导致粘度更高.
- 这些发现为铁在地质和工业酸盐系统中的行为提供了关键的见解.
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