Abstract The borosilicate glass-ceramics containing zirconolite phase were prepared successfully and the effect of cerium and neodymium on their phases, microstructure and aqueous chemical durability has been investigated in detail. The results show that zirconolite is the main crystalline phase in borosilicate glass-ceramics. With increasing the contents of CeO2 and Nd2O3 to 15 wt%, the transformation from zirconolite-2M to zirconolite-4M occurs, which leads to accommodating larger amounts of rare-earth ions compared with those without the phase transformation. Oxyapatite phase appears in the glass-ceramics while increasing the contents of CeO2 and Nd2O3 to 40 wt%, which insignificantly influences the chemical durability of final glass-ceramics. After 28 leaching days, normalized leaching rates of Ca, Si and Nd are in order of 10−3, 10−3, 10−4 g m−2 d−1 from MCC-1 test respectively, which shows the good chemical durability of glass-ceramics. The obtained conclusions suggest that the glass-ceramic containing zirconolite as main crystalline phase is a potential candidate for immobilizing high-level nuclear wastes, which are rich in lanthanides and actinides.

中文翻译：

---

CeO2和Nd2O3对用于固定核废料的硼硅酸盐微晶玻璃相、微观结构和水性化学耐久性的影响

摘要 成功制备了含锆英石相的硼硅酸盐微晶玻璃，并详细研究了铈和钕对其物相、微观结构和水性化学耐久性的影响。结果表明，锆英石是硼硅酸盐微晶玻璃的主要晶相。随着 CeO2 和 Nd2O3 的含量增加到 15 wt%，锆石-2M 向锆石-4M 的转变发生，与没有相变的那些相比，这导致容纳更多的稀土离子。氧化磷灰石相出现在微晶玻璃中，同时将 CeO2 和 Nd2O3 的含量增加到 40 wt%，这对最终微晶玻璃的化学耐久性影响不大。浸出 28 天后，Ca、Si 和 Nd 的归一化浸出率依次为 10-3、10-3、分别来自 MCC-1 测试的 10−4 g m−2 d−1，表明微晶玻璃具有良好的化学耐久性。所得结论表明，以锆英石为主晶相的微晶玻璃是固定富含镧系元素和锕系元素的高放核废料的潜在候选物。