Identification of BeO and BeOxDy in melted zones of the JET Be limiter tiles: Raman study using comparison with laboratory samples - Archive ouverte HAL
Article Dans Une Revue Nuclear Materials and Energy Année : 2018

Identification of BeO and BeOxDy in melted zones of the JET Be limiter tiles: Raman study using comparison with laboratory samples

Y. Ferro

Résumé

Beryllium oxide (BeO) and deuteroxide (BeO x D y) have been found on the melted zone of a beryllium tile extracted from the upper dump plate of JET-ILW (2011-2012 campaign). Results have been obtained using Raman microscopy, which is sensitive to both the chemical bond and crystal structure, with a micrometric lateral resolution. BeO is found with a wurtzite crystal structure. BeO x D y is found as three different types which are not the β-phase but behaves as molecular species like Be(OD) 2 , O(Be-D) 2 and DBeOD. The presence of a small amount of trapped D 2 O is also suspected. Our results therefore strongly suggest that D trapping occurs after melting through the formation of deuteroxides. The temperature increase favors the formation of crystal BeO which favors deuterium trapping through OD bonding.
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Dates et versions

hal-02193871 , version 1 (24-07-2019)

Identifiants

Citer

M. Kumar, C. Makepeace, C. Pardanaud, Y. Ferro, E. Hodille, et al.. Identification of BeO and BeOxDy in melted zones of the JET Be limiter tiles: Raman study using comparison with laboratory samples. Nuclear Materials and Energy, 2018, 17, pp.295-301. ⟨10.1016/j.nme.2018.11.008⟩. ⟨hal-02193871⟩
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