Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7963119 | Journal of Nuclear Materials | 2018 | 8 Pages |
Abstract
In this study, Y2Ti2O7 pyrochlore waste forms were rapidly prepared by self-propagating high-temperature synthesis plus quick pressing (SHS/QP) using CuO as the oxidant and Ti as the reductant. As the surrogate of trivalent actinides, Nd was introduced to substitute the Y site with nominal formulation of Y2-xNdxTi2O7. Highly densified Nd-bearing Y2Ti2O7 pyrochlore waste forms were readily synthesized within 5â¯min from this process. The pyrochlore phase was generated as the exclusive ceramic phase within xâ¯â¤â¯1.0, while higher Nd2O3 incorporation (xâ¯>â¯1.0) results in impurity phases. Phase separation can be detected in the ceramic matrix, which is actually composed of Nd-rich and Y-rich pyrochlore solid-solutions. The representatively selected waste form (Nd0.5) demonstrates promising aqueous durability as the 42 days normalized leaching rates of Cu, Y and Nd are measured to be 4.67â¯Ãâ¯10â2, 4.42â¯Ãâ¯10â5 and 3.17â¯Ãâ¯10â5â¯gâ¯m-2â¯d-1.
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
Kuibao Zhang, Zongsheng He, Jiali Xue, Wenwen Zhao, Haibin Zhang,