Author/Authors :
Jeong، نويسنده , , Sun-Chan and Katayama، نويسنده , , Ken-ichiro and Kawakami، نويسنده , , Hirokane and Watanabe، نويسنده , , Yutaka and Ishiyama، نويسنده , , Hironobu and Imai، نويسنده , , Nobuaki and Hirayama، نويسنده , , Yoshikazu and Miyatake، نويسنده , , Hiroari and Sataka، نويسنده , , Masao and Sugai، نويسنده , , Hiroyuki and Okayasu، نويسنده , , Satoru and Ichikawa، نويسنده , , Shin-Ichi and Nishio، نويسنده , , Katsuhisa and Mitsuoka، نويسنده , , Shinichi and Nakanoya، نويسنده , , Takamitsu and Hashimoto، نويسنده , , Takashi and Hashimoto، نويسنده , , Takanori and Yahagi، نويسنده , , Masahito، نويسنده ,
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.
Keywords :
Composition- dependent diffusion , Constitutional defects , Interaction between defects , Short-lived diffusion tracer , NaTl-type intermetallic compound
