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Journal Articles

Diffusion experiment with the accelerated, shorot-lived radioactive beam of $$^{8}$$Li

Jeong, S.-C.*; Sugai, Hiroyuki; Yahagi, Masahito*

Nihon Butsuri Gakkai-Shi, 64(9), p.687 - 691, 2009/09

We have demonstrated a non-destructive and on-line radiotracer method for diffusion studies in lithium ionic conductors, by using, as a tracer, the short-lived alpha-emitting radioisotope of $$^{8}$$Li from TRIAC (Tokai Radioactive Ion Accelerator Complex). The method has been successfully applied to measure the lithium diffusion coefficients in a typical defect-mediated lithium ionic conductor of LiGa, well demonstrating that the method is very effective to measure the diffusion in the micrometer regime per second. Anomalous composition-dependence of Li diffusion coefficients in LiGa was observed. The anomaly was discussed qualitatively in terms of the formation of defect complex and the interaction between the constituent defects. The ordering of the Li vacancies in the Li-deficient LiGa was observed for the first time in terms of the Li diffusion by the present method, and its thermodynamic aspect was discussed.

Journal Articles

On-line diffusion tracing in Li ionic conductors by the short-lived radioactive beam of $$^{8}$$Li

Jeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Watanabe, Yutaka*; Ishiyama, Hironobu*; Imai, Nobuaki*; Hirayama, Yoshikazu*; Miyatake, Hiroari; Sataka, Masao; Sugai, Hiroyuki; et al.

Japanese Journal of Applied Physics, 47(8), p.6413 - 6415, 2008/08

 Times Cited Count:5 Percentile:24.13(Physics, Applied)

A non-destructive and on-line diffusion tracing in Li ionic conductors has been demonstrated. As a tracer, pulsed beam of $$^{8}$$Li was implanted into LiGa. By analyzing the time dependent yield of the $$alpha$$-particles decaying from $$^{8}$$Li, diffusion coefficients were extracted with a high accuracy. The ordering of Li vacancies in the Li-deficient $$beta$$ phase of LiGa was observed for the first time in terms of the Li diffusion.

Journal Articles

Diffusion of $$^{8}$$Li short-lived radiotracer in Li ionic conductors of NaTl-type intermetallic compounds

Sugai, Hiroyuki; Sataka, Masao; Okayasu, Satoru; Ichikawa, Shinichi; Nishio, Katsuhisa; Mitsuoka, Shinichi; Nakanoya, Takamitsu; Osa, Akihiko; Sato, Tetsuya; Hashimoto, Takashi; et al.

Defect and Diffusion Forum, 273-276, p.667 - 672, 2008/00

Journal Articles

Measurement of self-diffusion coefficients in Li ionic conductors by using the short-lived radiotracer of $$^8$$Li

Jeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Watanabe, Yutaka*; Ishiyama, Hironobu*; Imai, Nobuaki*; Hirayama, Yoshikazu*; Miyatake, Hiroari; Sataka, Masao; Okayasu, Satoru; et al.

Journal of Phase Equilibria and Diffusion, 26(5), p.472 - 476, 2005/09

Authors developed a radiotracer method for diffusion studies in solids. The experimental test was performed by the measurement of the diffusion coefficients of Li in a sample of the compound $$beta$$LiAl using an $$alpha$$-emitting radiotracer of $$^8$$Li(T$$_{1/2}$$ = 0.84 s). It was found that the time-dependent yields of the alpha particles from the diffusing 8Li that was initially implanted in the sample could be used as a measure of the diffusivity of the tracer in a nondestructive way. The method was applied to measure the self-diffusion coefficients of Li in $$beta$$LiGa, and for investigating how the Li diffusion in the Li ionic conductors is affected by the concentration of atomic defects.

Journal Articles

Measurement of diffusion coefficients in solids by the short-lived radioactive beam of $$^{8}$$Li

Jeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Watanabe, Yutaka*; Ishiyama, Hironobu*; Miyatake, Hiroari*; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki; Ichikawa, Shinichi; et al.

Nuclear Instruments and Methods in Physics Research B, 230(1-4), p.596 - 600, 2005/04

 Times Cited Count:6 Percentile:46.82(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Simulation study on the measurements of diffusion coefficients in solid materials by short-lived radiotracer beams

Jeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Ishiyama, Hironobu*; Miyatake, Hiroari*; Sataka, Masao; Iwase, Akihiro; Okayasu, Satoru; Sugai, Hiroyuki; Ichikawa, Shinichi; et al.

Japanese Journal of Applied Physics, Part 1, 42(7A), p.4576 - 4583, 2003/07

no abstracts in English

Journal Articles

Simulation study on the measurements of diffusion coefficients in solid materials by short-lived radiotracer beams

Jeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Ishiyama, Hironobu*; Miyatake, Hiroari*; Sataka, Masao; Iwase, Akihiro*; Okayasu, Satoru; Sugai, Hiroyuki; Ichikawa, Shinichi; et al.

Japanese Journal of Applied Physics, Part 1, 42(7A), p.4576 - 4583, 2003/07

 Times Cited Count:14 Percentile:51.71(Physics, Applied)

no abstracts in English

Journal Articles

Radiation effects on Li-vacancy ordering in $$beta$$-LiAl at low temperatures

Sugai, Hiroyuki; Yahagi, Masahito*; Kuriyama, Kazuo*; Maeta, H.*

JAERI-Conf 99-013, p.204 - 206, 2000/01

no abstracts in English

Journal Articles

Release of tritium, protium, and helium from neutron-irradiated Li-Al alloy.II

Sugai, Hiroyuki; Tanase, Masakazu; Yahagi, Masahito*

Journal of Nuclear Materials, 254(2-3), p.151 - 157, 1998/00

 Times Cited Count:2 Percentile:25.2(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Defect structure in neutron-irradiated $$beta$$-$$^{6}$$LiAl and $$beta$$-$$^{7}$$LiAl; Electrical resistivity and Li diffusion

Sugai, Hiroyuki; Tanase, Masakazu; Yahagi, Masahito*; *; Hamanaka, Hiromi*; Kuriyama, Kazuo*; *

Physical Review B, 52(6), p.4050 - 4059, 1995/08

 Times Cited Count:17 Percentile:70.22(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Radiation effects on Li-vacancy ordering in $$beta$$-LiAl

Kuriyama, Kazuo*; *; *; Sugai, Hiroyuki; Maeta, Hiroshi; Yahagi, Masahito*

Physical Review B, 52(5), p.3020 - 3022, 1995/08

 Times Cited Count:4 Percentile:26.83(Materials Science, Multidisciplinary)

no abstracts in English

Oral presentation

Li diffusion in NaTl-type intermetallic compound LiGa observed by $$^{8}$$Li short-lived radiotracer

Sugai, Hiroyuki; Sataka, Masao; Okayasu, Satoru; Ichikawa, Shinichi; Nishio, Katsuhisa; Mitsuoka, Shinichi; Nakanoya, Takamitsu; Osa, Akihiko; Sato, Tetsuya; Hashimoto, Takashi; et al.

no journal, , 

Non-destructive and on-line Li diffusion experiments in Li ionic conductors are conducted using the short-lived $$alpha$$-emitting radiotracer of $$^{8}$$Li. 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 $$beta$$-LiGa. The diffusion coefficients obtained for $$beta$$-LiGa with Li content of 43-54 at.% at room temperature are discussed in terms of the interaction between Li-ion and the structural defects in the specimen, compared with the case of $$beta$$-LiAl and $$beta$$-LiIn. The nonlinear Li-content dependency of Li diffusion coefficients for $$beta$$-LiGa suggests that the Li diffusion with Li-deficient region is obstructed by the defect complex composed of vacancies at the Li sites.

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