Depth profiles of trapped deuterium in nickel bombarded with helium-3

Takagi, Ikuji; Kariyama, Hirokazu; Shin, Kyuchul; Higashi, Kunio

doi:10.1016/0022-3115(93)90333-t

Cited by 10 publications

(19 citation statements)

References 25 publications

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“…The peak is attributed to deuterium atoms on the surface [5]. The kinetic energy of deuterium particles from plasma is as low as a few eV [6]; therefore, the particles are not implanted into the bulk region, but absorbed on the surface.…”

Section: Resultsmentioning

confidence: 98%

“…One reason for this large discrepancy may be surface roughness. The depth resolution was 160 nm in the case of nickel samples [5], for which the surface was considered to be flat. The depth resolution of 400 nm in the present work indicates that the sample surface was very rough and hence the effective area of the surface was very large.…”

Section: Resultsmentioning

confidence: 99%

“…5 5.0 Â 10 20 1.8 Â 10 27 1.5 Â 10 À17 44. 1 8.5 Â 10 20 2.0 Â 10 27 1.5 Â 10 À17 (Average) 6.0 Â 10 20 1.8 Â 10 27 1.5 Â 10 À17 563 11.7 4.5 Â 10 20 1.6 Â 10 27 6.0 Â 10 À17 22.…”

Section: Tableunclassified

“…1 6.0 Â 10 20 1.7 Â 10 27 6.0 Â 10 À17 (Average) 5.5 Â 10 20 1.7 Â 10 27 6.0 Â 10 À17 630 11.7 1.0 Â 10 21 7 Â 10 26 3.0 Â 10 À16 22. 5 1.0 Â 10 21 7 Â 10 26 3.0 Â 10 À16 44. 1 1.0 Â 10 21 9 Â 10 26 3.0 Â 10 À16 of the data.…”

Section: Tableunclassified

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Deuterium diffusion in a chemical densified coating observed by NRA

Takagi

Kobayashi

Ueyama

et al. 2009

Journal of Nuclear Materials

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Tableunclassified

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Deuterium diffusion in a chemical densified coating observed by NRA

Takagi

Kobayashi

Ueyama

et al. 2009

Journal of Nuclear Materials

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“…The present study utilizes an in situ observation technique [7] for characterization of the hydrogen trap. This is a new method in which the deuterium depth profiles of a sample are measured by means of NRA under continuous deuterium charging from a plasma source.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen trapping in 3He-irradiated Fe

Takagi

Matsuoka

Tanaka

et al. 2013

Nuclear Instruments and Methods in Physics Research Section B:

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The characteristics of irradiation-induced hydrogen (deuterium) traps in pure Fe were investigated for quantitative evaluation of tritium retention in fusion reactor components. The deuterium depth profiles of an Fe disk sample exposed to deuterium plasma were observed by means of nuclear reaction analysis (NRA) before and after irradiation with 0.8 MeV or 1.3 MeV 3 He ions. Irradiation generated a number of traps, and deuterium retention was drastically increased subsequent to irradiation. Steady-state deuterium concentration in the trap and the solution sites were obtained by continuously charging the sample with deuterium during the NRA. Based on these values, the trapping energy, which is the enthalpy difference between the two sites, was estimated to be 0.38 eV. The number ratio of the trap to atomic displacement was 0.013. Some of the traps were annihilated around 523 K. The annihilation temperature, the trapping energy, and the equilibrium constant suggest that the trap is a dislocation loop introduced by the irradiation. It is deduced that the tritium inventory in the Fe components of a reactor should be drastically increased by neutron irradiation due to the formation of traps, but may be significantly reduced by high temperature operation of the components.

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