稀土元素对CaCO3结晶的影响:对动力学,机制和晶体形态学的洞察
Luca Terribili1, Remi Rateau1, Adrienn M Szucs1
1Department of Geology. School of Natural Sciences, Trinity College Dublin, Dublin D02PN40, Ireland.
Crystal growth & design
|January 22, 2024
概括
稀土元素 (REEs) 显著减缓碳酸 (CaCO3) 结晶,改变晶体形状. 即使是少量的REEs也会影响CaCO3的形成,影响其结构和生长机制.
科学领域:
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
- 晶体学 晶体学是指结晶学.
背景情况:
- 碳酸 (CaCO3) 是一种无处不在的矿物质,具有多样化的地质和工业应用.
- 了解影响CaCO3结晶的因素对于控制其特性至关重要.
- 众所周知,稀土元素 (REEs) 与矿物沉过程相互作用.
研究的目的:
- 研究稀土元素 (REE) 对碳酸 (CaCO3) 结晶动力学和机制的影响.
- 确定不同度和REEs组合如何影响CaCO3多态形成和晶体形态.
- 阐明REEs在修改CaCO3生长途径中的作用.
主要方法:
- 紫外线视频光谱测量用于监测反应动力学.
- 粉末X射线衍射 (PXRD) 用于相位识别.
- 高分辨率电子显微镜 (HREM) 用于形态和结构分析.
主要成果:
- 微量的REEs (La,Nd,Dy) 显著减缓了CaCO3结晶率.
- REEs影响了CaCO3多态,有利于有缺陷的瓦特里特和具有复杂形态的石.
- REEs在石表面上的吸附被认为是改变生长和复杂形态的机制.
结论:
- REEs充当CaCO3结晶的强有力的抑制剂和修饰剂.
- 可再生能源的度和原子质量,以及前体阶段的形成,影响CaCO3的生长.
- 对CaCO3形态的REEs诱导的变化表明非经典的结晶路径和选择性表面吸附.
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