Al2O3对独居石玻璃陶瓷固化体的影响

本文研究了Al₂O₃掺量对独居石玻璃陶瓷固化体结构和化学稳定性的影响。用傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）方法表征样品结构，用溶解速率法和全谱直读等离子体发射光谱（ICP-OES）分别测定样品在浸出液中浸泡后的失重速率及各元素的浸出浓度，以研究固化体的化学稳定性。研究结果表明：当Al₂O₃掺量为4%（摩尔分数）时，在980 ℃下保温3 h得到的独居石玻璃陶瓷固化体具有较高的化学稳定性，浸泡14 d时其质量浸出率最低，约为8.1 ng/(cm²?min)，其中Ce、La元素在浸出液中均未检出；固化体的主晶相为独居石，结构中含有大量稳定的正磷酸基团［PO₄］^3-和少量的焦磷酸基团［P₂O₇］^4-，不存在偏磷酸基团［PO₃］^-。

Effect ofAl2O3 on Monazite Glass-ceramic Wasteform

The effects of monazite glass-ceramic wasteforms containing different Al₂O₃ contents on their structures and properties were investigated. The structure of the glass-ceramic wasteforms was analyzed by Fourier transform infrared (FTIR) and X-radiation diffraction (XRD). The chemical stability of monazite glass-ceramic wasteforms was measured by dissolution rate and inductively coupled plasma optical emission spectrometry (ICP-OES) method. The results show that the chemical stability of monazite glass ceramic wasteforms with 4% (mole fraction) Al₂O₃ and made at 980 ℃ for 3 h is optimal. The 14 d leaching rate of monazite glass-ceramic wasteforms is about 8.1 ng/(cm²•min), which is the lowest in all the samples. The main crystalline phase of the as prepared glass-ceramic wasteforms is monazite. There are a large number of ［PO₄］^3- groups, a small number of ［P₂O₇］^4- groups, and no ［PO₃］^- groups in the wasteforms.