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Immobilization of simulated waste into pure Gd2Zr2O7 pyrochlore without space occupancy design |
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| Authors: | Jianjun Wu Fen Luo Xiaoyan Shu Shunzhang Chen Guilin Wei Bingsheng Li Yi Xie Wenqing Yuan Facheng Yi Xirui Lu |
| Affiliation: | 1. State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang, P. R. China;2. Collaborative Innovation Center of Nuclear Wastes and Environmental Safety, Southwest University of Science and Technology, Mianyang, P. R. China;3. Collaborative Innovation Center of Nuclear Wastes and Environmental Safety, Southwest University of Science and Technology, Mianyang, P. R. China Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang, P. R. China;4. Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang, P. R. China Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, P. R. China;5. Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang, P. R. China;6. University of Science and technology of China, Hefei, P. R. China Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, P. R. China |
| Abstract: | In this study, different molar ratios of Nd:Ce were directly mixed with prepared pure Gd2Zr2O7 powders without space occupancy design. Samples were obtained by performing sparking plasma sintering (SPS) at 1750°C for 5 minutes. X-ray diffraction (XRD) results show that maximum solid solubility of simulated radionuclides can reach 50 mol%. In addition, all samples with the maximum solid solubility have high compactness, and all elements are evenly distributed on the surface of the samples. The samples show a better crystallization effect as the molar ratio of Nd:Ce increases. The maximum solid solubility increases from 42 mol% to 50 mol% when the amount of Nd2O3 reaches 66 mol%. |
| Keywords: | directly mixed nuclear waste pure Gd2Zr2O7 powders sparking plasma sintering |