Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7963230 | Journal of Nuclear Materials | 2018 | 7 Pages |
Abstract
Synroc is recognized as an ideal matrice for the immobilization of high-level radioactive waste (HLW). In this study, the Synroc mineral of pyrochlore was employed as host phase for the immobilization of Nd2O3, which was selected as surrogate of trivalent actinide nuclides. Gd2-xNdxTi1.3Zr0.7O7/Cu composites were rapidly synthesized by self-propagating high-temperature synthesis plus quick pressing (SHS/QP) using CuO as the oxidant and Ti as the reductant. The result shows that the Nd2O3 doped reactions could be ignited as xâ¯â¤â¯1.4 and Gd2-xNdxTi1.3Zr0.7O7 pyrochlores were successfully prepared with Cu as the secondary phase. The synthesized pyrochlore-based waste form exhibits density of 4.93â¯g/cm3 and Vickers hardness of 14.90â¯GPa, as well as promising aqueous durability. The LRGd and LRNd value of the xâ¯=â¯1.4 sample are as low as 3.28â¯Ãâ¯10â5 and 2.27â¯Ãâ¯10â5â¯gâ¯mâ2·dâ1 after 42 days leaching.
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
Zongsheng He, Kuibao Zhang, Le Peng, Wenwen Zhao, Jiali Xue, Haibin Zhang,