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Progress in the knowledge of the mechanism of tritium release from lithium ceramics

F. Botter, S. Tistchenko, M. Briec, J.P. Kopasz1991年Fusion Engineering and DesignIF 1.7出版社

AbstractTritium extraction experiments have been performed in various experimental conditions, most of the time out-of-pile, with a sweep gas containing 1000 vpm H2 and at fixed temperatures. They were performed on pure or doped lithium aluminates or orthosilicates. The fine material texture, the type of defects created by dopant insertion, and Li+ mobility were known by various techniques. Analysis of the tritium release has shown the presence of several types of sites for tritium and has allowed the study of the mechanisms' respective role as a function of experimental conditions, such as sample texture. In the particular case of large diameter single crystals, a combined contribution of diffusion and internal sites seems to explain the results obtained; in the case of sintered materials, the limiting step could be a desorption from discrete activation energies sites.

日本語訳

トリチウム抽出実験は、様々な実験条件下で実施され、そのほとんどは炉外で、100 vpmのH2を含むスイープガスを用い、固定温度で行われた。実験は、純粋な、またはドープされたリチウムアルミン酸塩またはオルトケイ酸塩に対して実施された。微細な材料組織、ドーパント導入によって生成された欠陥の種類、およびLi+の移動度は、様々な手法によって把握された。トリチウム放出の解析により、トリチウムに対して複数の種類のサイトが存在することが示され、実験条件(試料組織など)の関数として、各メカニズムの役割を研究することが可能となった。特に大口径の単結晶の場合、拡散と内部サイトの複合的な寄与が得られた結果を説明すると思われる。焼結材料の場合、律速段階は、離散的な活性化エネルギーサイトからの脱離である可能性がある。

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