Solute diffusion of hydrogen isotopes in tungsten-a gas loading experiment

The diffusion of protium and deuterium in tungsten is measured in gas loading experiments as a function of temperature for a hydrogen isotope loading pressure of 500 mbar and temperatures between 1600 K and 2600 K. The diffusion parameters are measured from the degassing rates of both a single-cryst...

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Bibliographic Details
Published inPhysica scripta Vol. T171; no. 1; pp. 14034 - 14042
Main Authors Holzner, G, Schwarz-Selinger, T, Dürbeck, T, Toussaint, U von
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.01.2020
Subjects
activation energy
deuterium
diffusion coefficient
hydrogen
solute diffusion
tungsten
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Summary:The diffusion of protium and deuterium in tungsten is measured in gas loading experiments as a function of temperature for a hydrogen isotope loading pressure of 500 mbar and temperatures between 1600 K and 2600 K. The diffusion parameters are measured from the degassing rates of both a single-crystalline and a polycrystalline tungsten cylinder by mass spectrometry. The data are analysed assuming an Arrhenius-like temperature dependence of the diffusivity and following the classical analysis approach of Frauenfelder (1969 J. Vac Sci. Technol. 6, 388). For deuterium in tungsten an activation energy of E A D = 0.28 0.06 eV is obtained. For protium the activation energy is identical within the uncertainty limits.
Bibliography:Royal Swedish Academy of Sciences
PHYSSCR-108959.R1
ISSN:0031-8949
1402-4896
DOI:10.1088/1402-4896/ab4b42