Shu Xiaoyan, Qing Qi, Wen Mingfen, Zhang Wei, Lu Yuexiang, Cheng Yanrong, Chen Jing, Dong Faqin, Lu Xirui
State Key Laboratory of Environmental Friendly Energy Materials, Southwest University of Science and Technology, Mianyang, Sichuan 621010, P. R. China.
Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang, Sichuan 621010, P. R. China.
Langmuir. 2022 Sep 27;38(38):11529-11538. doi: 10.1021/acs.langmuir.2c00610. Epub 2022 Sep 13.
To safely dispose radioactive waste (including, e.g., thorium and radiostrontium), Ce and Sr were chosen as simulated surrogates of α and β waste and were introduced into the Gd site in GdZrO to maintain the average cationic radius and to compensate for charge. A series of GdSrCeZrO (0.00 ≤ ≤ 0.25) compounds were examined by experimental and theoretical calculations to investigate the co-doping effects of α and β waste in a GdZrO-based matrix. The effects of Ce and Sr content on the phase, unit cell parameters, active modes, mechanical property, and microstructure were studied systematically. Moreover, the limit of incorporation of Ce and Sr in GdZrO pyrochlore and the lattice parameters were also calculated through virtual crystal approximation theory, and the results were found to well agree with experimental results.
为了安全处置放射性废物（例如钍和放射性锶），选择铈（Ce）和锶（Sr）作为α和β废物的模拟替代物，并将它们引入到钆锆石（GdZrO）的钆（Gd）位点，以维持平均阳离子半径并补偿电荷。通过实验和理论计算研究了一系列GdSrCeZrO（0.00 ≤ ≤ 0.25）化合物，以探究α和β废物在基于GdZrO的基质中的共掺杂效应。系统地研究了Ce和Sr含量对相、晶胞参数、活性模式、力学性能和微观结构的影响。此外，还通过虚拟晶体近似理论计算了Ce和Sr在钆锆石型结构中的掺入极限和晶格参数，结果发现与实验结果吻合良好。
