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

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*

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 LiAl using an -emitting radiotracer of Li(T = 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 LiGa, and for investigating how the Li diffusion in the Li ionic conductors is affected by the concentration of atomic defects.