Identification of BeO and BeOxDy in melted zones of the JET Be limiter tiles: Raman study using comparison with laboratory samples
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.
Origine | Publication financée par une institution |
---|
Loading...