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タイトル: | Lithium Vapor Chemistry of Hyper-Stoichiometric Lithium Metatitanate Li₂.₁₂(₂)TiO₃+y |
著者: | Mukai, Keisuke https://orcid.org/0000-0001-8067-8732 (unconfirmed) Yasumoto, Masaru Terai, Takayuki |
著者名の別形: | 向井, 啓祐 |
発行日: | 21-May-2020 |
出版者: | American Chemical Society (ACS) |
誌名: | The Journal of Physical Chemistry C |
巻: | 124 |
開始ページ: | 10870 |
終了ページ: | 10877 |
抄録: | Developing a better ceramic breeder (Li-containing oxide) is a key challenge for realizing fuel-self-sufficient fusion reactors. Ceramic breeder pebbles of hyper-stoichiometric lithium metatitanate, Li2+xTiO3+y (Li/Ti > 2), have been developed for a demonstration fusion reactor as high Li density enhances fuel tritium production. Previous studies have reported that Li loss by vaporization at high temperatures was largely enhanced by the increase in Li/Ti ratio and environmental moisture concentration. Minimizing the Li loss is a key issue for sufficient tritium breeding and reduced corrosion of structural steel. However, a suitable environmental parameter for hyper-stoichiometric Li2+xTiO3+y pebbles has not yet been determined because of the unavailability of thermodynamic data. Herein, a solid/gas equilibria for Li2.12(2)TiO3+y was investigated by measuring vapor pressures using atmosphere controllable Knudsen cell high temperature mass spectrometry. The enhanced thermodynamic activities of Li and Li2O in Li2.12(2)TiO3+y in comparison with those in stoichiometric Li2TiO3 were obtained as functions of temperature and oxygen concentration. The equilibrium constants were used to achieve the optimum moisture concentration that can suppress the vapor reactions in a cylindrical breeding zone with inhomogeneous temperature distribution. |
著作権等: | This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see https://doi.org/10.1021/acs.jpcc.0c02454. The full-text file will be made open to the public on 8 May 2021 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/251191 |
DOI(出版社版): | 10.1021/acs.jpcc.0c02454 |
出現コレクション: | 学術雑誌掲載論文等 |
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