【摘要】 为了探索模拟三价锕系核素在Gd2Zr2O7基材中的快速固化方法,按照化学计量关系Gd 2-x Nd xZr2O7(x=0.42和x=0.86)设计配方,以Gd2O3,ZrO2和Nd2O3(Nd3+作三价锕系核素替代物)粉体为原料,进行了高温高压合成实验。制备的样品通过X射线衍射分析和扫描电镜分析表明:在压力分别为3 GPa,3.5 GPa,4 GPa,温度为1 573 K,1 673 K条件下保温保压15 min,获得了单相烧绿石结构的Gd 2-x Nd xZr2O7致密烧结体。该方法可为锆基烧绿石陶瓷固化锕系核素提供一种快速高效的技术途径。更多还原

【Abstract】 In order to investigate a rapid method to incorporate simulated trivalent actinides into Gd2Zr2O7 host phase,synthesis experiments were conducted at high pressure and high temperature using the mixtures of Gd2O3,ZrO2 and Nd2O3 powders as starting materials with stoichiometric Gd2-xNdxZr2O7(x=0.42 and x=0.86,Nd3+ as a surrogate of the trivalent actinides).The samples prepared at pressures of 3 GPa,3.5 GPa,4 GPa and temperatures of 1 573 K,1 673 K with 15 min holding time were analyzed by XRD and SEM.The results indicate that Gd2-xNdxZr2O7 compounds with single phase isometric pyrochlore structure and densely sintered compacts were gained.The applied method in the present study provides a rapid and efficient approach to study the immobilization of actinides in zircon-based ceramic hosts.更多还原