Phase and structure in the system Gd2−xEu xZr2O7 (0.0 ⩽ x ⩽ 2.0)

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

doi:10.1007/s11595-014-0856-0

Journal of Wuhan University of Technology Materials Science Edition ›› 2014, Vol. 29 ›› Issue (1) : 1 -4. DOI: 10.1007/s11595-014-0856-0

Advanced Materials

Phase and structure in the system Gd_2−xEu_xZr₂O₇ (0.0 ⩽ x ⩽ 2.0)

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Abstract

Pyrochlore Gd₂Zr₂O₇ are considered as an excellent candidate for treatment of radioactive waste forms, because of its superior physical, chemical and anti-irradiation properties. To investigate the phase and structure of pyrochlore Gd₂Zr₂O₇ used for immobilizing Pu (III), trivalent europium was used as the simulacrum for plutonium with trivalence. The compounds of stoichiometry Gd_2−xEu_xZr₂O₇ (0.0 ⩽ x ⩽ 2.0) synthesized by high temperature solid state reaction method, were analyzed with the help of XRD and Rietveld structural refinement method. The results indicated that the phases of compounds continuously kept the phase of pyrochlore under our experimental condition. The linear relation between a and x was discovered in the system of Gd_2−xEu_xZr₂O₇ (0.0 ≤ x ≤ 2.0) at 1 773 K, which accorded with a = 10.538 41 + 0.008 95 x, V = 1 170.373 32 + 2.985 97 x.

Keywords

pyrochlore / phase relation / radioactive waste / structural refinement

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Xirui Lu, Faqin Dong, Gongbao Song, Ning Liu, Xiaoli Wang, Yanlin Wu. Phase and structure in the system Gd_2−xEu_xZr₂O₇ (0.0 ⩽ x ⩽ 2.0). Journal of Wuhan University of Technology Materials Science Edition, 2014, 29(1): 1-4 DOI:10.1007/s11595-014-0856-0

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