Abstract
Using Nd and Ce with the ratio of 1:5 as simultaneous substitutions of trivalent and tetravalent actinides in gadolinium zirconate, a series of Gd2-xNdxZr2-5xCe5xO7 (0 ≤ x ≤ 0.4) ceramics were prepared by rapid microwave sintering with a co-precipitation assisted solvothermal synthesized nanocrystalline powders. The simulated proportional nuclear waste disposal behaviours were identified by various characterization methods. XRD results show that when x is less than 0.4, all samples only have the single defect fluorite structure, while Gd1.2Ce0.8O3.2 is formed in Gd1.6Nd0.4Ce2O7 as x raise to 0.4. The relative density and average grain size both increase with the elevation of sintered temperature and x value. Sintering maps show that the obvious grain growth happens when x ≥ 0.3 and the densification processes can occur at different sintering temperatures with different x values.
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