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Journal Articles

${it Operando}$ structure observation of pyroelectric ceramics during power generation cycle

Kawasaki, Takuro; Fukuda, Tatsuo; Yamanaka, Satoru*; Sakamoto, Tomokazu*; Murayama, Ichiro*; Kato, Takanori*; Baba, Masaaki*; Hashimoto, Hideki*; Harjo, S.; Aizawa, Kazuya; et al.

Journal of Applied Physics, 131(13), p.134103_1 - 134103_7, 2022/04

Journal Articles

Pyroelectric power generation from the waste heat of automotive exhaust gas

Kim, J.*; Yamanaka, Satoru*; Murayama, Ichiro*; Kato, Takanori*; Sakamoto, Tomokazu*; Kawasaki, Takuro; Fukuda, Tatsuo; Sekino, Toru*; Nakayama, Tadachika*; Takeda, Masatoshi*; et al.

Sustainable Energy & Fuels (Internet), 4(3), p.1143 - 1149, 2020/03

 Times Cited Count:3 Percentile:51.8(Chemistry, Physical)

JAEA Reports

Theoretical study of the Cs isotope exchange reaction of CsI + Cs'$$rightarrow$$ Cs + ICs' (Contract research)

Kobayashi, Takanori; Hashimoto, Masashi; Yokoyama, Keiichi

JAEA-Research 2015-014, 7 Pages, 2015/12

JAEA-Research-2015-014.pdf:2.46MB

To discuss the exchange reaction of Cs isotope by CsI + Cs'$$rightarrow$$ Cs + ICs', the structure and chemical properties of Cs$$_2$$I intermediate and potential energy surface are calculated using M06/def2-TZVPPD density functional calculation. The calculation shows that the reaction to the intermediate has no barrier and the two Cs-I bonds of Cs$$_2$$I are chemically equivalent. Thus, the collision of CsI + Cs' results in Cs exchange with the high probability.

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

Oral presentation

Effect of minor alloying element on dispersing nano-particles in ODS steel

Uchida, Yosuke*; Nagai, Yoshiyasu*; Suda, Takanori*; Hashimoto, Naoyuki*; Onuki, Somei*; Shibayama, Tamaki*; Yamashita, Shinichiro; Akasaka, Naoaki

no journal, , 

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.

Oral presentation

Fundamental study for development of austenitic ODS steel; Effect of nano-particle dispersion on radiation-induced defect formation

Yamashita, Shinichiro; Otsuka, Satoshi; Watanabe, Masashi*; Uchida, Yosuke*; Suda, Takanori*; Hashimoto, Naoyuki*; Onuki, Somei*; Shibayama, Tamaki*

no journal, , 

no abstracts in English

Oral presentation

Theoretical investigation of the Cs exchange reaction between CsI molecule and Cs atom

Kobayashi, Takanori; Hashimoto, Masashi; Yokoyama, Keiichi

no journal, , 

To investigate the possibility of the Cs exchange reaction between CsI molecule and Cs atom, we have analyzed the Cs-I-Cs triatomic molecule by using quantum chemistry calculation. And, by using the newly developed capture model, the Cs exchange reaction rate and its temperature dependence were also estimated. The stabilization energy for CsICs formation is calculated as 12 kcal mol$$^{-1}$$, which is much smaller than the calculated Cs-I bond energy of 82 kcal mol-1(spin-orbit correlation is not included). However, the bond lengths of both Cs-I are optimized as the same value (3.57 A). That is, Cs of CsI and colliding Cs atom cannot be distinguished if the triatomic structure is formed. And 2-dimensional potential energy surface around CsI against Cs atom shows that the reaction has no entrance barrier. The reaction rate was estimated to be the same value as the collision rate and little temperature dependence would be expected.

Oral presentation

Theoretical study of the Cs exchange reaction rate constant of Cs + CsI $$rightarrow$$ CsI + Cs

Kobayashi, Takanori; Hashimoto, Masashi; Yokoyama, Keiichi

no journal, , 

To investigate the possibility of the Cs exchange reaction, we have analyzed the Cs-I-Cs triatomic molecule by using quantum chemistry calculation. Furthermore, by using the newly developed capture model, the Cs exchange reaction rate and its temperature dependence were estimated. 2-dimensional potential energy surface around CsI against Cs atom shows that the reaction has no entrance barrier. The reaction rate was found to be close to the collision rate and to have a little temperature dependence would be expected.

Oral presentation

Development of treatment for low radioactive effluent in Tokai Reprocessing Plant, 18; Practical study on Cs and Sr adsorption process in LWTF

Ito, Yoshiyuki; Matsushima, Ryotatsu; Sato, Fuminori; Hashimoto, Takanori*; Suzuki, Tatsuya*; Miyabe, Shinsuke*; Sakuma, Takashi*; Kikuchi, Kaoru*; Izumi, Takeshi*

no journal, , 

no abstracts in English

13 (Records 1-13 displayed on this page)
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