Tritium diffusion in V, Nb and Ta

Qi, Zhao; Völkl, J.; Lässer, R.; Wenzl, H.

doi:10.1088/0305-4608/13/10/015

Cited by 139 publications

(41 citation statements)

References 30 publications

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“…In the case of V, the present data are in good agreement with the reported data, as observed in the case of Nb. However, regarding the data for Ta, we found higher values of E a and D 0 than those reported by Qi et al 5) A possible cause of this discrepancy is the experimental temperature in the present study (293-623 K) being higher than that in the study of . In a lower temperature region (< 373 K), both data are comparable to each other.…”

Section: Methodscontrasting

confidence: 97%

“…The experimental error of D t was about AE5%. The present data are compared with those previously reported by Qi et al 5) with the Gorsky effect measurement in the temperature range between 133 and 373 K, which are represented as dashed lines. These lines were extrapolated from their reported values of the activation energy of diffusion E a and the pre-exponential factor D 0 as summarized in Table 1, in which the present data are also shown.…”

Section: Methodsmentioning

confidence: 65%

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Effect of Coexistent Hydrogen Isotopes on Tracer Diffusion of Tritium in Alpha Phase of Group-V Metal-Hydrogen Systems

Sakamoto

Hashizume

Sugisaki

2009

Journal of Nuclear Science and Technology

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Tracer diffusion coefficients of tritium in the alpha phase of group-V metal-hydrogen systems, -MH(D)xTy (M ¼ V and Ta; x ) y), were measured in order to clarify the effects of coexistent hydrogen isotopes on the tritium diffusion behavior. The hydrogen concentration dependence of such behavior and the effects of the coexistent hydrogen isotopes (protium and deuterium) were determined. The results obtained in the present (for V and Ta) and previous (for Nb) studies revealed that tritium diffusion was definitely dependent on hydrogen concentration but was not so sensitive to the kind of coexistent hydrogen isotopes. By summarizing those data, it was found that the hydrogen concentration dependence of the tracer diffusion coefficient of tritium in the alpha phase of group-V metals could be roughly expressed by a single empirical curve.

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Section: Methodscontrasting

confidence: 97%

Section: Methodsmentioning

confidence: 65%

Effect of Coexistent Hydrogen Isotopes on Tracer Diffusion of Tritium in Alpha Phase of Group-V Metal-Hydrogen Systems

Sakamoto

Hashizume

Sugisaki

2009

Journal of Nuclear Science and Technology

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“…This supports the notion that much of the deviation reported in the literature may be due to surface recombination limitation at lower temperature. At lower temperatures, there was an increased deviation in the measured D H /D D from 2 , which has also been observed by others [125,127] and in the diffusivity of T [128]. The heavier hydrogen isotopes do not diffuse much slower than predicted until temperatures below ca.…”

Section: < Figure 14 Here>supporting

confidence: 78%

Tritium Barriers and Tritium Diffusion in Fusion Reactors

Causey

Karnesky

Marchi

2012

Comprehensive Nuclear Materials

132

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Tritium and deuterium induce radiation in reactor materials and some radioactive tritium gas may be released. Most of the materials used in fusion reactors are metals that have relatively high permeabilities for tritium. The fusion community has been working on barriers to minimize tritium release. Unfortunately, most barrier materials work very well during laboratory experiments, but fail to meet requirements when placed in radiation environments.This chapter presents tritium permeation characteristics of various materials used in fusion reactors, including plasma-facing, structural, and barrier materials. The necessary parameters for tritium release calculations for various regions of a fusion reactor are given.

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“…2 we compare our results for the Nb-H system [9] in the harmonic approximation and with anharmonic corrections to the experimental data [18]. The importance of the anharmonicity for the magnitude of the diffusion constant is evident.…”

Section: Resultsmentioning

confidence: 79%

Diffusion of hydrogen in transition metals

Schober

Stoneham

1991

Journal of the Less Common Metals

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The mobility of interstitial atoms is closely correlated with their vibrational behaviour. Not only can the classical (hopping) activation energy be evaluated with good accuracy from the vibrational spectrum, but also low temperature tunnelling rates are strongly related to vibrations. Because of their small mass interstitial hydrogen atoms constitute an ideal probe to study this correlation over a large temperature range (0 K < T < 300 K). Hydrogen atoms vibrate mainly with localized (optical) modes but also with strongly distorted lattice vibrations (short-wavelength acoustic modes). These vibrations lead to a "dressing" of the tunnelling element. More interesting, they determine the temperature dependence of the diffusion constant (at low temperatures together with electronic terms). Using a realistic description of the vibrations as input we calculate the diffusion constants quantitatively. We present results for hydrogen in niobium and in lutetium.

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Tritium diffusion in V, Nb and Ta

Cited by 139 publications

References 30 publications

Effect of Coexistent Hydrogen Isotopes on Tracer Diffusion of Tritium in Alpha Phase of Group-V Metal-Hydrogen Systems

Effect of Coexistent Hydrogen Isotopes on Tracer Diffusion of Tritium in Alpha Phase of Group-V Metal-Hydrogen Systems

Tritium Barriers and Tritium Diffusion in Fusion Reactors

Diffusion of hydrogen in transition metals

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