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Surficial chemical states of Li$$_{3}$$N synthesized on lithium target for boron neutron capture therapy

BNCT治療装置用リチウムターゲット表面のLi$$_{3}$$N層の化学的状態

石山 新太郎; 馬場 祐治 ; 藤井 亮*; 中村 勝*; 今堀 良夫*

Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

BNCT治療装置のリチウムターゲット表面の蒸発防止を目的に窒化した表層汚染除去を高温乖離法で行った結果、下記結論を得た。(1)1023Kまでの乖離処理によりLi$$_{3}$$N表層のコンタミ層で融点が1023K以下のものの除去は可能である。(2)主要な汚染化合物はH$$_{2}$$Oのほか、LiOH並びにLi$$_{2}$$CO$$_{3}$$が考えられ、これらは高真空中で残存しているH$$_{2}$$O及びCO$$_{2}$$とのLi$$_{3}$$N分解反応により生じたものである。

To remove high level of contaminants by O and C from Li$$_{3}$$N surface for BNCT target, high temperature thermal desorption was conducted up to 1123 K in ultra high vacuum and the following results were derived; (1) During thermal desorption up to 1023 K, typical three peaks of vacuum pressure disturbance due to vaporization of contaminants were observed in vacuum pressure-temperature curve. (2) Over-layered contaminants with high melting temperature below 1023 K on Li$$_{3}$$N surface is completely removed by high temperature thermal desorption up to 1123 K in ultra high vacuum. (3) From these desorption results, it is suggested that these contaminants corresponding to these vaporization peaks are H$$_{2}$$O and Li compounds with high melting temperature below 1023 K, of which LiOH and Li$$_{2}$$CO$$_{3}$$ were synthesized by decomposition process of Li$$_{3}$$N with residual H$$_{2}$$O and CO$$_{2}$$ in low temperature.

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パーセンタイル:15.38

分野:Materials Science, Multidisciplinary

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