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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Niobium- and bismuth-silver phosphate glasses for the conditioning of radioactive iodine
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Niobium- and bismuth-silver phosphate glasses for the conditioning of radioactive iodine

机译：用于放射性碘的铌和铋 - 银磷酸盐玻璃

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摘要

Iodine 129 is a radioactive waste produced by the nuclear industry. Due to its high volatility, it cannot be vitrified in conventional borosilicate glasses. This paper investigates the feasibility of iodine conditioning using a glass matrix intended for long-term storage in a geological repository. Silver phosphate glasses, which can incorporate high amounts of iodine and can be synthesized at low temperature, were chosen for this study. In order to increase their chemical durability, the glasses were cross-linked by niobium and bismuth oxides. Niobium and bismuth incorporation limits were determined for an iodine amount of 12 wt% and ranged from 1.6 mol% to 4.0 mol%, depending on the Ag2O/P2O5 ratio. The glass structures were investigated using P-31 MAS NMR, RAMAN spectroscopy and X-ray absorption spectroscopy. The iodine local environment was determined by EXAFS at iodine K-edge. Structural investigations showed that the introduction of these cross linking reagents induces a significant increase in the polymerization degree of the glasses. However despite this higher connectivity, the two cross linking reagents have a low impact on the glass transition temperature after iodine addition.
机译：碘129碘是由核工业生产的放射性废物。由于其高挥发性，不能在常规硼硅酸盐玻璃中玻璃化。本文研究了旨在在地质储存库中的长期储存的玻璃矩阵的碘调理的可行性。选择磷酸盐玻璃，其可以包含大量碘，可以在低温下合成这项研究。为了提高化学耐久性，玻璃通过铌和氧化物交联。根据Ag 2 O / P 2 O 5的比例，测定铌量为12wt％的碘量，碘量为12wt％，范围为1.6摩尔％至4.0mol％。使用P-31 MAS NMR，拉曼光谱和X射线吸收光谱研究研究玻璃结构。碘局部环境由碘k边缘的外缘确定。结构研究表明，这些交联试剂的引入诱导玻璃聚合度的显着增加。然而，尽管连接较高的连接性，但两种交联试剂对碘加入后对玻璃化转变温度的影响很低。

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