Fe2O3对含铈钙钛矿玻璃陶瓷物相结构及化学稳定性的影响
Effect of Fe2O3 on Phase Structure and Chemical Stability of Cerium-Containing Perovskite Glass-Ceramics
蒲博洋 1廖其龙 1王辅 1古雨鑫 1胥有利 1竹含真1
作者信息
- 1. 西南科技大学材料与化学学院,绵阳 621010
- 折叠
摘要
本文以典型SiO2-B2O3-CaO-Na2O-Ti02硼硅酸盐玻璃为基础玻璃,采用热处理析晶法制备含铈钙钛矿玻璃陶瓷固化体.通过DSC、XRD、FTIR、SEM-EDS、ICP等测试方法研究了不同Fe2O3含量对该固化体物相结构及化学稳定性的影响.结果表明,随着Fe2O3的掺入,CeO2晶体衍射峰强度逐渐减弱,钙钛矿(CaTiO3)晶粒分布的均匀程度呈先升高后降低的趋势,所有元素的归一化浸出率呈先降低后升高的趋势.当Fe2O3含量为6％(质量分数)时,CeO2晶体消失,晶粒的分布最为均匀,所有元素的归一化浸出率最低.28 d后,所有样品中元素的归一化浸出率(g·m-2·d-1)均低于10-3数量级,这表明所制备的玻璃陶瓷固化体具有优异的化学稳定性.本研究为采用钙钛矿玻璃陶瓷固化体处理高放核废液提供了理论支撑和实验指导.
Abstract
In this paper,based on the typical SiO2-B2O3-CaO-Na2O-TiO2 borosilicate glass,the cerium-containing perovskite glass-ceramic waste form was prepared by heat treatment crystallization method.The effect of different Fe2O3 content on the phase structure and chemical stability of the waste form was studied by DSC,XRD,FTIR,SEM-EDS and ICP.The results show that with the addition of Fe2O3,the diffraction peak intensity of CeO2 crystal gradually decreases,the uniform of perovskite(CaTiO3)grain distribution shows a trend of increasing first and then decreasing,and the normalized leaching rates of all elements show a trend of decreasing first and then increasing.When the content of Fe2O3 is 6％(mass fraction),the CeO2 crystal disappears,the distribution of grains is the most uniform,and the normalized leaching rate of elements is the lowest.After 28 d,the normalized leaching rates(g·m-2·d-1)of elements in all samples are lower than the order of magnitude of 10-3,indicating that the prepared glass-ceramic waste form has excellent chemical stability.The findings of this research offer theoretical support and experimental guidance for the study of perovskite glass-ceramics solidified high-level liquid waste.
关键词
Fe2O3/钙钛矿/氧化铈/玻璃陶瓷/物相结构/化学稳定性Key words
Fe2O3/perovskite/cerium oxide/glass-ceramics/phase structure/chemical stability引用本文复制引用
基金项目
国家重点研发计划"固废资源化"重点专项(2019YFC1904900)
出版年
2024
国家科技期刊平台
NSTL
万方数据