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Title: Behaviors of Si, B, Al, and Na during electrochemical reduction of borosilicate glass in molten CaCl₂
Authors: Katasho, Yumi
Yasuda, Kouji
Nohira, Toshiyuki  kyouindb  KAKEN_id
Author's alias: 片所, 優宇美
安田, 幸司
野平, 俊之
Keywords: borosilicate glass
electrochemical reduction
molten salt
potential–pO²⁻ diagram
vitrified radioactive wastes
Issue Date: 2017
Publisher: Electrochemical Society Inc.
Journal title: Journal of the Electrochemical Society
Volume: 164
Issue: 7
Start page: D478
End page: S485
Abstract: The 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.
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, http://creativecommons.org/licenses/by-nc-nd/4.0/), 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: oa@electrochem.org.
URI: http://hdl.handle.net/2433/234816
DOI(Published Version): 10.1149/2.1201707jes
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