Preparation of Gd2Zr2O7 nanoceramics from two-step thermal treatment and the aqueous durability analysis |
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| Affiliation: | 1. CAS Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, PR China;2. University of Chinese Academy of Sciences, Beijing, 100049, PR China;3. Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, PR China;4. CNRS, CEMHTI UPR 3079, Univ. Orléans, Orléans, F-45071, France;1. Key Subject Laboratory of National Defense for Radioactive Waste and Environmental Security, Southwest University of Science and Technology, Mianyang, Sichuan 621010, PR China;2. China Academy of Engineering Physics, Mianyang, Sichuan 621900, PR China;1. State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, China;2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, China;3. National Defense Key Discipline Lab of Nuclear Waste and Environmental Safety, Southwest University of Science and Technology, Mianyang, 621010, 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;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 |
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| Abstract: | Gd2Zr2O7 ceramics demonstrate important prospect in the immobilization of high-level radioactive wastes (HLWs). In this study, Gd2Zr2O7 nanoceramics were fabricated using two-step method, where Gd2Zr2O7 nanopowder was firstly synthesized by solvothermal method and Gd2Zr2O7 nanoceramics were subsequently sintered via self-propagating chemical furnace plus quick pressing (SCF/QP). The characterization results display that the Gd2Zr2O7 nanocrystalline ceramics with average grain size of 78 nm and bulk density of 5.53 g cm−3 were successfully prepared. The results of MCC-1 static leaching experiments show that the normalized release rate (LRi) of Gd is 2.2 × 10−2 g m−2•d−1 on the first day and converges to 1.2 × 10−3 g m−2•d−1 after 42 days. Zr shows superior chemical stability as the 21 days LRZr value is as low as 2.7 × 10−6 g m−2•d−1, which becomes constant as the leaching duration prolongs. |
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| Keywords: | Solvothermal method Chemical furnace Nanoceramics Aqueous durability |
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