Effect of decades of corrosion on the microstructure of altered glasses and their radiation stability
Effect of decades of corrosion on the microstructure of altered glasses and their radiation stability
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DOI：
10.1038/s41529-020-0115-0
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发表时间：
2020-04
影响因子：
5.1
通讯作者：
A. H. Mir;Amreen Jan;J. Delaye;S. Donnelly;J. Hinks;S. Gin
中科院分区：
文献类型：
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作者：
A. H. Mir;Amreen Jan;J. Delaye;S. Donnelly;J. Hinks;S. Gin
了解玻璃在与水和辐射相互作用过程中的微观结构演变，对于解决地质处置条件下核废料的腐蚀问题至关重要。本文报道了两种硼硅酸盐玻璃超过21年的腐蚀结果。结果表明，在含钙玻璃中形成了中孔C-S-H凝胶，在含铝玻璃中形成了以微孔为主的微孔结构。然后用重离子辐照这些多孔腐蚀玻璃，以模拟反冲核损伤的影响，并使用带有原位离子辐照的透射电子显微镜对其进行实时监测。弹道碰撞显著地将多孔腐蚀玻璃愈合为无气孔的均匀微结构。除了提供有关掺杂玻璃和实际废物形式在腐蚀和辐射下如何演变的新见解和预测外，结果还突显了现有腐蚀模型的非普遍性，以及玻璃成分和辐射损伤在腐蚀过程中微结构演变中的重要作用。
Understanding the microstructural evolution of glasses during their interaction with water and radiation is of fundamental importance in addressing the corrosion of nuclear waste forms under geological disposal conditions. Here we report the results of more than 21 years of corrosion of two borosilicate glasses showing the formation of mesoporous C–S–H gels in Ca-bearing glasses and a mainly microporous microstructure in Al-bearing glasses. These porous corroded glasses were then irradiated with heavy ions to simulate the effects of recoil nucleus damage and monitored in real time using transmission electron microscopy with in situ ion irradiation. The ballistic collisions remarkably healed the porous corroded glasses to a pore-free homogeneous microstructure. Besides providing new insights and predictions about how doped glasses and actual waste forms may evolve under corrosion and irradiation, the results highlight the non-universal nature of the existing corrosion models and the important role that the glass composition and radiation damage play in the evolution of the microstructure during corrosion.