Abstract
Highly densified Nd-bearing Y2Ti2O7 pyrochlores were prepared within 5min by self-propagating high-temperature synthesis plus quick pressing (SHS/QP) using Fe2O3 as the oxidant. As the surrogate of trivalent actinides, Nd was introduced to substitute the Y site with nominal formulation of Y2−xNdxTi2O7. The ordered pyrochlore phase was generated as the main ceramic phase with x≤1.0. Phase separation of Nd-rich and Y-rich phases is formed in the pyrochlore matrix. The pyrochlore-base waste form (Nd0.5) demonstrates promising aqueous durability. The 42days normalized leaching rates of Y and Nd are calculated to be 2.59×10−5 and 2.80×10−5gm−2d−1.
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