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Low temperature and pressure synthesis of lithium-nitride compound with H$$_{2}$$O addition on lithium target for BNCT

BNCT治療装置用リチウムターゲット表面の水添加低温低圧窒化リチウム合成

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治療装置用リチウムターゲット表面にN$$_{2}$$/H$$_{2}$$O混合ガスを超高真空中で吹きかけ、低温低圧での窒化実験を行った結果、下記結論が得られた。(1)1$$times$$10$$^{-8}$$Paの超高真空中で101.3PaN$$_{2}$$ガスによりリチウム表面にリチウム-窒素化合物が形成した。(2)13.3$$sim$$80Pa/1.33$$sim$$4.7PaN$$_{2}$$/H$$_{2}$$O混合ガスの吹きかけにより生成した化合物表面にO及びCの顕著なコンタミが発生した。(3)しかしながら、0.013$$sim$$0.027Pa/1.33$$sim$$4.7PaN$$_{2}$$/H$$_{2}$$Oの条件下では窒化もコンタミを生じなかった。(4)O及びCのコンタミは1.33PaH$$_{2}$$O以上の過剰添加により増長する。

Low temperature synthesis of lithium-nitride compound was conducted on the lithium target for BNCT by N$$_{2}$$/H$$_{2}$$O mixing gas squirt in ultra high vacuum chamber, and the following results were derived; (1) Lithium-nitride compound was synthesized on lithium target under 101.3 PaN$$_{2}$$ gas squirt at room temperature and 1$$times$$ 10$$^{-8}$$ Pa in ultra high vacuum chamber. (2) Remarkable contamination by O and C was observed on the lithium-nitride compound synthesized by 13.3 $$sim$$ 80 Pa/1.33 $$sim$$ 4.7 Pa N$$_{2}$$/H$$_{2}$$O mixing gas squirt. (3) No contamination and synthesis of Li-N compound was observed at 0.013 $$sim$$ 0.027 Pa/0 $$sim$$ 0.005 Pa N$$_{2}$$/H$$_{2}$$O squirt. (4) Contamination by O and C is enhanced with excessive addition of over 1.33 Pa H$$_{2}$$O addition.

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パーセンタイル:31.72

分野:Materials Science, Multidisciplinary

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