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Tritium diffusivity in lithium-based ceramic breeders irradiated with neutrons

Kenji Okuno, Hiroshi Kudo1989年Fusion Engineering and DesignIF 1.7出版社

The thermal release behavior of tritium produced in neutron-irradiated Li2O, γ-LiAlO2, Li2SiO3, Li4SiO4, Li2ZrO3 and Li8ZrO6 crystals was studied with emphasis laid on the tritium release kinetics. The tritium produced in these oxidic ceramic materials irradiated with neutrons was released mainly in the chemical form of tritiated water (HTO) when heated in a vacuum. The HTO(g) release process of oxidic ceramic materials was explained by a mixed regime effect where the bulk diffusion of T+ and solid-surface reaction of OT− compete for overall control of the release rate. The observed order of tritium diffusivity in these materials was D(Li8ZrO6) − D(Li4SiO4) >D(Li2O) >D(Li2ZrO3) >D (Li2SiO3) >D(γ-LiAlO2). The tritium diffusivity increased with an increase of the lithium-atom density in these materials.

日本語訳

中性子照射したLi₂O、γ-LiAlO₂、Li₂SiO₃、Li₄SiO₄、Li₂ZrO₃およびLi₆ZrO₆結晶中で生成したトリチウムの熱放出挙動を、トリチウム放出速度論に重点を置いて研究した。これらの酸化物セラミックス材料を中性子照射して生成したトリチウムは、真空中で加熱すると主にトリチウム水(HTO)の化学形で放出された。酸化物セラミックス材料のHTO(g)放出過程は、T⁺のバルク拡散とOT⁻の固体表面反応が放出速度の全体支配を競う混合律速効果によって説明された。これらの材料におけるトリチウム拡散係数の観測された順序は、D(Li₆ZrO₆) − D(Li₄SiO₄) > D(Li₂O) > D(Li₂ZrO₃) > D(Li₂SiO₃) > D(γ-LiAlO₂)であった。トリチウム拡散係数は、これらの材料におけるリチウム原子密度の増加とともに増加した。

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