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dc.contributor.authorKatasho, Yumi-
dc.contributor.authorYasuda, Kouji-
dc.contributor.authorNohira, Toshiyuki-
dc.contributor.alternative片所, 優宇美-
dc.contributor.alternative安田, 幸司-
dc.contributor.alternative野平, 俊之-
dc.description.abstractThe electrochemical reduction of borosilicate glass in molten CaCl₂ at 1123 K was investigated. The behaviors of the constituent elements, i.e., Si, B, Al, Na, and K, were estimated using potential-pO²⁻ diagrams constructed from the thermodynamic data for the species. The diagrams suggested that the first cathodic wave in the cyclic voltammogram results from the reduction of the B₂O₃ component. The dissolution of the Na₂O and K₂O components, which was predicted from the diagrams, was confirmed by energy dispersive X-ray analysis of a borosilicate glass plate after immersion into molten CaCl₂ without electrolysis. The scanning electron microscopy/wavelength dispersive X-ray mappings and Raman spectrum for borosilicate glass reduced at 0.9 V vs. Ca²⁺/Ca indicated that SiO₂ and B₂O₃ are reduced to Si and B-Si compound. The formation of Ca-Al-O compounds owing to the increase of O²⁻ ions is suggested. The pO²⁻ range during electrolysis at 0.9 V was indicated to be 2.95-3.46.-
dc.publisherElectrochemical Society Inc.-
dc.rights© The Author(s) 2017. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND,, which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email:
dc.subjectborosilicate glass-
dc.subjectelectrochemical reduction-
dc.subjectmolten salt-
dc.subjectpotential–pO²⁻ diagram-
dc.subjectvitrified radioactive wastes-
dc.titleBehaviors of Si, B, Al, and Na during electrochemical reduction of borosilicate glass in molten CaCl₂-
dc.type.niitypeJournal Article-
dc.identifier.jtitleJournal of the Electrochemical Society-
dc.addressInstitute of Advanced Energy, Kyoto University-
dc.addressAgency for Health, Safety and Environment, Kyoto University・Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University-
dc.addressInstitute of Advanced Energy, Kyoto University-
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