[en] Beryllium oxide (BeO) and deuteroxide (BeO_xD_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_xD_y is found as three different types which are not the beta-phase but behaves as molecular species like Be(OD)₂, O(Be-D)₂ and DBeOD. The presence of a small amount of trapped D₂O 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. (authors)