Phase and Rietveld Refinement of Pyrochlore Gd_2Zr_2O_7 Used for Immobilization of Pu(Ⅳ)  

作　　者：卢喜瑞 DONG Faqin SONG Gongbao LIU Ning LI Weimin WU Yanlin WANG Xiaoli 

机构地区：[1]Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University [2]Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology [3]Research Center of Laser Fusion, CAEP, Southwest University of Science and Technology [4]School of High Energy Accelerator Science, Graduate University for Advanced Studies [5]Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2014年第2期233-236,共4页武汉理工大学学报（材料科学英文版）

基　　金：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)

摘　　要：The phase of pyrochlore Gd_2Zr_2O_7 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 Gd_2Zr_2-_xCe_xO_7 （0.0≤x≤2.0） were synthesized via a high temperature solid reaction method with Gd_2O_3 and ZrO_2 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.The phase of pyrochlore Gd_2Zr_2O_7 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 Gd_2Zr_2-_xCe_xO_7 （0.0≤x≤2.0） were synthesized via a high temperature solid reaction method with Gd_2O_3 and ZrO_2 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.

关 键 词：PYROCHLORE IMMOBILIZATION PLUTONIUM rietveld structural refinement 

分 类 号：TQ133.3[化学工程—无机化工]