On-Line Diffusion Tracing In Li Ionic Conductors By The Short-Lived Radioactive Beam Of Li-8

A non-destructive and on-line diffusion tracing in Li ionic conductors has been demonstrated. As the tracer, the pulsed beam of the short-lived alpha-emitting radioisotope of Li-8 was implanted into it typical Li ionic conductor LiGa. By analyzing the time-dependent yields of the alpha-particles measured in coincident with the repetition cycle of the beam. the tracer diffusion coefficients were extracted with a Pod accuracy. The ordering of the U vacancies in the Li-deficient phase of LiGa was observed for the first time in terms of the Li diffusion by the present method.