Role of grain boundaries and carbon deposition in deuterium retention behavior of deuterium plasma exposed tungsten

Data on deuterium retention in W single and polycrystals exposed to D plasma at 500 K are presented. The energy of D ions was well below the threshold of damage production. In a W polycrystal the deuterium spreads to a depth of about 4 μm. In contrast, no deuterium was found even at a depth of 2 μm...

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Bibliographic Details
Published inJournal of nuclear materials Vol. 290; pp. 433 - 436
Main Authors Komarov, D.A., Markin, A.V., Rybakov, S.Yu, Zakharov, A.P.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.2001
Subjects
Carbon
Grain boundaries
Hydrides
Hydrogen
Tungsten
Grain boundaries
T10
C01
Hydrogen
Tungsten
C03
Hydrides
H05
Carbon
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Summary:Data on deuterium retention in W single and polycrystals exposed to D plasma at 500 K are presented. The energy of D ions was well below the threshold of damage production. In a W polycrystal the deuterium spreads to a depth of about 4 μm. In contrast, no deuterium was found even at a depth of 2 μm in a W single crystal. This is an indication of significant grain boundary transport of deuterium at relatively low temperature. It has been found that ∼10 nm thin carbon layers grown on the plasma facing surface can be a barrier for D penetration into the bulk of tungsten.
ISSN:0022-3115
1873-4820
DOI:10.1016/S0022-3115(00)00511-0