Phase and rietveld refinement of pyrochlore Gd2Zr2O7 used for immobilization of Pu (IV)

Xirui Lu; Faqin Dong; Gongbao Song; Ning Liu; Weimin Li; Yanlin Wu; Xiaoli Wang

doi:10.1007/s11595-014-0899-2

Journal of Wuhan University of Technology Materials Science Edition ›› 2014, Vol. 29 ›› Issue (2) : 233 -236. DOI: 10.1007/s11595-014-0899-2

Advanced Materials

Phase and rietveld refinement of pyrochlore Gd₂Zr₂O₇ used for immobilization of Pu (IV)

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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 Gd₂Zr_2−xCe_xO₇ (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.

Keywords

pyrochlore / immobilization / plutonium / rietveld structural refinement

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Xirui Lu, Faqin Dong, Gongbao Song, Ning Liu, Weimin Li, Yanlin Wu, Xiaoli Wang. Phase and rietveld refinement of pyrochlore Gd₂Zr₂O₇ used for immobilization of Pu (IV). Journal of Wuhan University of Technology Materials Science Edition, 2014, 29(2): 233-236 DOI:10.1007/s11595-014-0899-2

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