Hydrothermal synthesis and spark plasma sintering of NaY zeolite as solid-state matrices for cesium-137 immobilization |
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| Affiliation: | 1. Far Eastern Federal University, 10 Ajax Bay, Russky Island, 690922 Vladivostok, Russia;2. Institute of General and Inorganic Chemistry of National Academy of Sciences of Belarus, Surganova st. 9/1, Minsk 220072, Belarus;3. Vladivostok State University of Economics and Service, Gogolya st., 41, Vladivostok 690014, Russia;4. Far East Geological Institute, Far Eastern Branch of Russian Academy of Sciences, 159, Prosp. 100-letiya Vladivostoka, Vladivostok 690022, Russia;5. Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences, 19 Kosygin St., 119991 Moscow, Russia;6. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;7. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Science, Beijing 100049, China;8. College of Material Science and Engineering, Nanjing Tech University, Nanjing 211816, China;1. School of Electrical Engineering and Computer Science, Louisiana State University, Baton Rouge, LA, 70803, USA;2. Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA, 70803, USA;3. Center for Computation and Technology, Louisiana State University, Baton Rouge, LA, 70803, USA;1. Far Eastern Federal University, 10 Ajax Bay, Russky Island, 690922, Vladivostok, Russia;2. Pacific State Medical University, 2, Ostryakova Aven, Vladivostok, 690990, Russia;3. CIC NanoGUNE BRTA, Donostia, SanSebastián, 20018, Spain;1. Institute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, 159, Prosp. 100-letiya Vladivostoka, Vladivostok, 690022, Russia;2. Far Eastern Federal University, 8, Sukhanova St., Vladivostok, 690091, Russia;3. Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences, 18, st. Kutateladze, Novosibirsk, 630128, Russia;1. Institute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, 159, Prosp. 100-letiya Vladivostoka, Vladivostok, 690022, Russia;2. Far Eastern Federal University, 8, Sukhanova St., Vladivostok, 690091, Russia |
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| Abstract: | Hydrothermal synthesis of NaY-type zeolite was carried out and the effect of temperature on the phase composition, crystal structure, textural characteristics, particle size and morphology, as well as sorption properties to Cs+ ions was studied. Solid-state matrices based on NaY zeolite the Faujasite structure containing 26.1 wt% cesium were obtained by spark plasma sintering (SPS) with high values of compressive strength (to 132.9 MPa) and Vickers microhardness to HV~ 698, Fracture toughness (K1c) ~ 1.26 MPa m1/2. The kinetics of ceramic matrices consolidation, phase composition and morphology using dilatometric studies, XRD, and SEM were studied. The thermogravimetric analysis shown the high thermal stability of the obtained samples up to 1300 °C. The high hydrolytic stability of CsAlSiO4 ceramic was proven (leaching rate of 2.33 ×10?8 g·cm?2·day?1 and cesium diffusion coefficient De 1.41 ×10?13), which exceeds the requirements of GOST R 50926–96 and ISO 6961:1982 for solid-state matrices. |
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| Keywords: | Ceramics Aluminosilicates Sorbents Cesium Radionuclides Leaching Rate Hydrolytic stability Sintering SPS |
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