| Phase and Rietveld Refinement of Pyrochlore Gd_2Zr_2O_7 Used for Immobilization of Pu(Ⅳ) |
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| 作者姓名： | 卢喜瑞 DONG Faqin SONG Gongbao LIU Ning LI Weimin WU Yanlin WANG Xiaoli |
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| 基金项目： | Funded Partly by the Key Project of National High Technology Research and Development Program-"863"Program(No.2009AA050703);the National Natural Science Foundation of China(Nos.41302028,41272050,and 21007052);the Open Foundation of Joint Laboratory for Extreme Conditions Matter Properties,Southwest University of Science and Technology and Research Center of Laser Fusion,CAEP(No.12zxjk04) |
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| 摘 要： | 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-x Ce x O7(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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