Self-propagating synthesis of Y2 − xNdxTi2O7 pyrochlore and its aqueous durability as nuclear waste form

Y2 − xNdxTi2O7/Fe composites were readily prepared within 5 min from SHS/QP process. Ordered Nd-bearing pyrochlore was generated as the main ceramic phase with x ≤ 1.0. The lattice constant and crystal cell volume of pyrochlore phase increase linearly with the increment of x value. The pyrochlore matrix is separated into two substitutional solid solution of Nd-rich and Y-rich phases. The pyrochlore-base waste form demonstrates promising aqueous durability.206