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Measurement of self-diffusion coefficients in Li ionic conductors by using the short-lived radiotracer of $$^8$$Li

短寿命放射性トレーサ$$^8$$Liを用いたリチウムイオン伝導体中での自己拡散係数測定

Jeong, S.-C.*; 片山 一郎*; 川上 宏金*; 渡辺 裕*; 石山 博恒*; 今井 伸明*; 平山 賀一*; 宮武 宇也; 左高 正雄; 岡安 悟; 須貝 宏行; 市川 進一; 西尾 勝久; 光岡 真一; 仲野谷 孝充; 矢萩 正人*; 橋本 恭能*; 高田 和典*; 渡辺 遵*; 石川 智子*; 岩瀬 彰宏*

Jeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Watanabe, Yutaka*; Ishiyama, Hironobu*; Imai, Nobuaki*; Hirayama, Yoshikazu*; Miyatake, Hiroari; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki; Ichikawa, Shinichi; Nishio, Katsuhisa; Mitsuoka, Shinichi; Nakanoya, Takamitsu; Yahagi, Masahito*; Hashimoto, Takanori*; Takada, Kazunori*; Watanabe, Mamoru*; Ishikawa, Tomoko*; Iwase, Akihiro*

放射性トレーサーによる固体中拡散の新しい方法を確立した。テスト実験では、$$^8$$Li(T$$_{1/2}$$=0.84s)を用いて$$beta$$LiAlでのリチウムの拡散係数を求めた。$$^8$$Liの崩壊により放出される$$alpha$$粒子強度の時間分布から拡散係数が得られることを確かめた。次にリチウムイオン伝導体中での原子欠陥がリチウムイオンの拡散に与える影響を調べるために、$$beta$$LiGa中での自己拡散計数を測定した。

Authors developed a radiotracer method for diffusion studies in solids. The experimental test was performed by the measurement of the diffusion coefficients of Li in a sample of the compound $$beta$$LiAl using an $$alpha$$-emitting radiotracer of $$^8$$Li(T$$_{1/2}$$ = 0.84 s). It was found that the time-dependent yields of the alpha particles from the diffusing 8Li that was initially implanted in the sample could be used as a measure of the diffusivity of the tracer in a nondestructive way. The method was applied to measure the self-diffusion coefficients of Li in $$beta$$LiGa, and for investigating how the Li diffusion in the Li ionic conductors is affected by the concentration of atomic defects.

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