High-pressure glass-ceramics for iodine nuclear waste immobilization: Preliminary experimental results |
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| Affiliation: | 1. Nantes Université, CNRS UMR6112, Laboratoire de Planétologie et Géosciences, F-44000, Nantes, France;2. Nantes Université, CNRS, Institut des Matériaux de Nantes Jean Rouxel, IMN, F-44000, Nantes, France;1. Anhui Engineering Research Center for High Efficiency Intelligent Photovoltaic Module, Chaohu University, Hefei, 238000, China;2. College of Mechanical Engineering, Chaohu University, Hefei, 238000, China;1. Materials and Structures Division, NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH, 44135, USA;2. University of Toledo, Toledo, OH, USA;1. Physics Department, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, 11942, Saudi Arabia;2. Physics and Electronics Department, Adekunle Ajasin University, Akungba Akoko, Postal code 342111, Ondo State, Nigeria;3. Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia;1. School of Mechanical Engineering, Henan University of Technology, Zhengzhou, 450001, PR China;2. School of Materials Science and Engineering, Henan University of Technology, Zhengzhou, 450001, PR China;3. State Key Laboratory of Power Metallurgy, Central South University, Changsha, 410083, PR China;4. Faculty of Engineering and Information Sciences, University of Wollongong, Northfields Avenue, Wollongong, NSW, 2522, Australia;5. State Key Lab of Silicate Materials for Architecture, Wuhan University of Technology, Wuhan, 430070, China;1. College of Chemistry and Chemical Engineering, Collaborative Innovation Center of Rare-Earth Functional Materials and Devices Development, Baoji University of Arts and Sciences, Baoji, 721016, China;2. College of Physics and Optoelectronic Technology, Baoji University of Arts and Sciences, Baoji, 721013, China;3. School of Physics, Xidian University, Xi''an, 710071, China;1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China;2. Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui University, Hefei, 230601, China |
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| Abstract: | Several matrix types have been considered for the immobilization of iodine radioisotopes from which glass-ceramics represent a serious candidate; however, I-bearing glass-ceramics are challenging owing to the iodine volatility. We have synthesised glass-ceramics from the partial crystallization of a parental glass enriched with different iodine sources (I2 and I2O5) under high-pressure conditions (up to 1.5 GPa). The samples were characterized using Scanning and Transmission Electron Microscopy and X-ray Diffraction. Using standard synthesis protocol: melting, nucleation and crystal growth, we have obtained glass-ceramics showing the coexistence between I-bearing glass (<0.8 mol.% I), nepheline (NaAlSiO4) and iodosodalite (Na8Al6Si6O24I2 with up to 14 mol.% I). For several samples, we observed also the presence NaPt3O4 witnessing a chemical reaction between the container walls and the inside experimental charge. The structure of iodosodalite is entirely resolved by Rietveld refinement of the XRD pattern for I2 experiments whereas it cannot be solved for I2O5 experiments suggesting a change in the iodosodalite structure probably due to the β cage filling by IO3? clusters instead of I?. Our present work could represent a potential solution to tackle the problem of iodine radioisotopes immobilization. |
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| Keywords: | Glass-ceramics Iodosodalite High-pressure Nuclear waste immobilization |
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