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Preparation and heavy-ion irradiation effects of Gd2CexZr2-xO7 ceramics

机译：Gd2CexZr2-xO7陶瓷的制备及重离子辐照效果

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A number of compositions with the general stoichiometry of Gd(2)CexZr(2-x)O(7) (0 <= x <= 2) ceramics have been synthesized and received irradiation tests at room temperature with Xe20+ ions in a broad fluence range. X-ray diffraction (XRD) measurements shows that Gd(2)CexZr(2-x)O(7) (0 <= x <= 0.2) samples adopt the pyrochlore structure, whereas Gd(2)CexZr(2-x)O(7) (0.2 <= x <= 2.0) samples predominantly displayed an anion deficient fluorite structure, indicating that the structures of Gd(2)CexZr(2-x)O(7) are determined by the content of doped Ce4+ ions. XRD results of irradiated samples (Gd2Zr2O7, Gd2Ce2O7) indicate that Gd2Zr2O7 was transformed into a radiation resistant anion deficient fluorite structure with increasing fluence, whereas the Gd2Ce2O7 was partially amorphized. It was found that the structural evolutions induced by irradiation are strongly dependent on the samples composition and ions fluence. In addition, SEM results show that the density and hardness of waste forms play an important role in the morphology modifications induced by irradiation. These results would be considered for design and elaboration of future matrices for actinide immobilization or transmutation.
机译：合成了许多具有Gd（2）CexZr（2-x）O（7）（0 <= x <= 2）陶瓷一般化学计量的成分，并在室温下以宽通量Xe20 +离子进行了辐射测试范围。 X射线衍射（XRD）测量显示Gd（2）CexZr（2-x）O（7）（0 <= x <= 0.2）样品采用烧绿石结构，而Gd（2）CexZr（2-x） O（7）（0.2 <= x <= 2.0）样品主要显示负离子萤石结构，表明Gd（2）CexZr（2-x）O（7）的结构由掺杂的Ce4 +离子的含量决定。辐照样品（Gd2Zr2O7，Gd2Ce2O7）的XRD结果表明，随着通量的增加，Gd2Zr2O7转变为抗辐射的负离子萤石结构，而Gd2Ce2O7则部分非晶化。发现辐照引起的结构演变在很大程度上取决于样品的组成和离子通量。此外，扫描电镜结果表明，废物形式的密度和硬度在辐照引起的形态变化中起着重要作用。这些结果将被用于设计和拟定未来的act系元素固定化或design变矩阵。

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