锆英石对模拟核素Ce~(4+)的固化能力

为研究锆英石对四价锕系核素的固化能力,利用Ce4+模拟四价锕系核素。以ZrO2、SiO2和CeO2粉体为原料设计了包容量为5%～20%(摩尔分数)的锆英石固化体配方,在1500℃下保温22h进行固化体的制备。利用X射线衍射仪、扫描电子显微镜、红外光谱仪和激光拉曼探针对所制备固化体的物相、结构及微观形貌进行了分析。研究结果表明:在固化体中虽加入了5%～20%的CeO2,但主物相仍以锆英石物相为主,且均具有较高的结晶度,随着CeO2添加量的增加,固化体的无序程度略显增强。

Capability of Zircon as Waste Forms for Immobilizing Simulated Actinides With Ce4+

In order to investigate the capability of synthetic zircon for immobilization of actinides with tetravalence, Ce⁴⁺ was used as the simulacrum for tetravalent actinides, synthesis experiments were heated for 22 h under 1 500 ℃, designing 5%-20% (mole fraction) dosage of waste forms by using ZrO₂, SiO₂ and CeO₂ powders as starting materials. The phases, structure and microcosmic shape of synthetic condensates were characterized by the help of X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared absorption spectrum (IR) and laser Raman microprobe (RMP). The results indicate that the major phase of synthesized waste forms gives first place to zircon phase although having added 5%-20% of CeO₂ in the solidified body. However, they still have good crystallinity. With the enhancing of CeO₂ in solidified body, the metamict degree of synthesis waste forms is slightly increased.