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 -emitting radioisotope of 8 Li was implanted into a typical Li ionic conductor LiGa. By analyzing the timedependent yields of the -particles measured in coincident with the repetition cycle of the beam, the tracer diffusion coefficients were extracted with a good accuracy. The ordering of the Li vacancies in the Li-deficient phase of LiGa was observed for the first time in terms of the Li diffusion by the present method.
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