Abstract
The phase of pyrochlore Gd2Zr2O7 used for immobilization of Pu (IV) was investigated, tetravalent cerium was used as the simulacrum for plutonium with tetravalence, and the compounds in the system Gd2Zr2−xCexO7 (0.0 ⩽ x ⩽ 2.0) were synthesized via a high temperature solid reaction method with Gd2O3 and ZrO2 powders being used as the starting materials. Based on the collected XRD data of the gained samples, the phase and microstructural change of compounds were calculated by means of rietveld structural refinement method. The experimental results indicated that the phases of compounds were changed from pyrochlore to fluorite-type phase with the increasing x. The linear relation between a and x was discovered in the range of fluorite-type phase, which accorded with a = 0.52748 + 0.00825 x (0.2 ⩽ x ⩽ 2.0), while V = 0.14668 + 0.00711 x (0.2 ⩽ x ⩽ 2.0) was also achieved.
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