Self-propagating High-temperature Synthesis of Sm and Zr Co-doped Gd2Ti2O7 Pyrochlore Ceramics as Nuclear Waste Forms
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2021年第2期
论文作者：谢达雁 张魁宝 LI Weiwei LUO Baozhu GUO Haiyan
文章页码：196 - 202
摘 要：We reported a rapid synthesis of Sm3+/Zr4+ 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.
谢达雁1，张魁宝1,2，LI Weiwei1，LUO Baozhu1，GUO Haiyan1
1. State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology2. National Defense Key Discipline Lab of Nuclear Waste and Environmental Safety, Southwest University of Science and Technology
摘 要：We reported a rapid synthesis of Sm3+/Zr4+ 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.
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