摘要
We reported a rapid synthesis of Sm^(3+)/Zr^(4+)co-doped Gd2Ti2O7 pyrochlore simulated nuclear wastes solidification by self-propagation plus quick pressing technique.With increment excess contents of Sm2O3 and ZrO2 from 0 to 10wt%,the phase composition of the products is a mixed phase of pyrochlore structure and defective fluorite structure by X-ray diffraction(XRD)analysis and Raman spectrum.In addition,the SEM results demonstrate the fracture surface and microstructure of Gd2Ti2O7-based pyrochlore.The densified pyrochlore waste form exhibits high bulk density of 5.56 g·cm^(-3) and vickers hardness of 11.20±0.2 GPa.The leaching tests show that the elemental leaching rates of Gd,Sm,and Cu after 42 days are 1.92×10^(-4),1.51×10^(-4),and 3.90×10^(-3) g·m^(-2)·d^(-1),respectively.
作者
谢达雁
张魁宝
LI Weiwei
LUO Baozhu
GUO Haiyan
XIE Dayan;ZHANG Kuibao;LI Weiwei;LUO Baozhu;GUO Haiyan(State Key Laboratory of Environment-friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China;National Defense Key Discipline Lab of Nuclear Waste and Environmental Safety,Southwest University of Science and Technology,Mianyang 621010,China)
基金
Funded by the National Natural Science Foundation of China(No.51672228)
the Project of State Key Laboratory of Environmentfriendly Energy Materials(Southwest University of Science and Technology,Nos.18fksy0214 and 20fksy11)
the Postgraduate Innovation Fund Project by Southwest University of Science and Technology(No.19ycx0016)
the Science Development Foundation of China Academy of Engineering Physics。
