Abnormal Li diffusion in β-LiGa by the formation of defect complex

Sun Chan Jeong, Ichiro Katayama, Hirokane Kawakami, Yutaka Watanabe, Hironobu Ishiyama, Nobuaki Imai, Yoshikazu Hirayama, Hiroari Miyatake, Masao Sataka, Hiroyuki Sugai, Satoru Okayasu, Shin Ichi Ichikawa, Katsuhisa Nishio, Shinichi Mitsuoka, Takamitsu Nakanoya, Takashi Hashimoto, Takanori Hashimoto, Masahito Yahagi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The diffusion coefficients of Li in the NaTl-type Li intermetallic compound of β-LiGa have been measured by using a short-lived radioactive diffusion tracer. As the tracer, the α-emitting radioisotope of 8Li delivered as the energetic and pulsed beam from Tokai Radioactive Ion Accelerator Complex (TRIAC) was implanted into the β-LiGa compounds with the composition in the range of about 43 to 54 at.% Li. By analyzing the time-dependent yields of the α-particles measured according to the repetition cycle of the beam, the tracer diffusion coefficients were extracted over the wide range of Li composition. Abnormal composition-dependence of Li diffusion coefficients in β-LiGa was observed; the stoichiometric β-LiGa showed the highest diffusivity of Li. By referring to the composition-dependent diffusivity of Li in the iso-structural β-LiAl and β-LiIn, we could identify the abnormal diffusion of Li in very Li-poor composition of β-LiGa. The anomaly has been discussed qualitatively in terms of the formation of defect complex and the interaction between the constitutional defects.

Original languageEnglish
Pages (from-to)626-630
Number of pages5
JournalSolid State Ionics
Volume180
Issue number6-8
DOIs
Publication statusPublished - 2009 May 14

Keywords

  • Composition- dependent diffusion
  • Constitutional defects
  • Interaction between defects
  • NaTl-type intermetallic compound
  • Short-lived diffusion tracer

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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