Rapid synthesis of Gd2Zr2O7 ceramics by flash sintering and its aqueous durability |
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| Affiliation: | 1. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, Sichuan, PR China;2. School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, Sichuan, PR China;3. Shaanxi Engineering Center of Metallurgical Slag Resource, Shaanxi Sci-Tech University, Hanzhong 723000, Shaanxi, PR China;1. Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang 621010, PR China;2. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, PR China;3. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, PR China;4. Tianfu College of Southwestern University of Finance and Economics, Mianyang 621010, PR China;1. Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang, 621010, Sichuan, China;2. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, Sichuan, China;3. Sichuan College of Traditional Chinese Medicine, Mianyang, 621000, Sichuan, China;1. College of Physics, Sichuan University, Chengdu, 610064, China;2. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Sichuan University, Chengdu, 610064, China;3. Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China;4. Key Laboratory of High Energy Density Physics of Ministry of Education, Sichuan University, Chengdu 610064, China;5. Institute for Advanced Study, Chengdu University, Chengdu 610106, China;1. State Key Laboratory of Environmental Friendly Energy Materials, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, PR China;2. Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, PR China;3. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, PR China;4. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, PR China;5. Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, PR China |
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| Abstract: | The high radiation resistance and long time stability of Gd2Zr2O7 ceramics make it a promising candidate for high level waste (HLW) immobilization materials. In this study, single phase nanocrystalline Gd2Zr2O7 was successfully synthesized and consolidated at temperatures around 1050 °C for only 1 min by flash sintering for the first time. The phase evolution and microstructural development during flash sintering were systematically studied and compared with the conventionally sintered samples. The flash sintered Gd2Zr2O7 exhibit defect fluorite structure, and a following heat treatment at 1400 °C could transform the Gd2Zr2O7 ceramics from defect fluorite phase into pyrochlore phase. The MCC-1 leaching test shows that the flash sintered Gd2Zr2O7 samples exhibit good aqueous durability. |
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| Keywords: | Flash sintering Radioactive waste immobilization |
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