Diffusion of ⁸Li Short-Lived Radiotracer in Li Ionic Conductors of NaTl-Type Intermetallic Compounds

Abstract:

Non-destructive and on-line Li diffusion experiments in Li ionic conductors are conducted using the short-lived !-emitting radiotracer of 8Li. The radiotracers produced as an energetic and pulsed ion beam from TRIAC (Tokai Radioactive Ion Accelerator Complex) are implanted into a structural defect mediated Li ionic conductor of NaTl-type intermetallic compounds ("-LiGa and "-LiIn). The experimental time spectra of the yields of !-particles are compared with simulated results and Li diffusion coefficients in the intermetallic compounds are extracted with an accuracy of ±10%. The diffusion coefficients obtained for "-LiGa with Li content of 43-54 at.% are discussed in terms of the interaction between Li-ion and the structural defects in the specimen, compared with the cases of "-LiAl and "-LiIn. The nonlinear Li-content dependency of Li diffusion coefficients for "-LiGa suggests that the Li diffusion with the Li-deficient region is obstructed by the defect complex composed of vacancies at the Li sites.

• Periodical: Defect and Diffusion Forum (Volumes 273-276)
• Pages: 667-672
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.273-276.667
• Online since: February 2008
• Authors: Hiroyuki Sugai, Masao Sataka, Satoru Okayasu, Shin Ichi Ichikawa, Katsuhisa Nishio, Shinichi Mitsuoka, Takamitsu Nakanoya, Akihiko Osa, Tetsuya Sato, Takashi Hashimoto, Sun Chan Jeong, Ichiro Katayama, Hirokane Kawakami, Yutaka Watanabe, Hironobu Ishiyama, Nobuaki Imai, Yoshikazu Hirayama, Hiroari Miyatake, Takanori Hashimoto, Masahito Yahagi
• Keywords: ⁸Li , Li Ionic Conductors, LIGA, Liln, NaTl-Type Intermetallic Compounds, Self-Diffusion Coefficient, Short-Lived Radiotracer

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