J. Phys. IV France 7 (1997) C2-1205-C2-1206
Studies of the Oxidation Mechanism of Yttrium Implanted Chromium Using XAFS and GAXRDP.N. Gibson, M.J. Cristóbal and M.F. Stroosnijder
Institute for Advanced Materials (Ispra Site) Joint Research Centre of the European Commission, 21020 Ispra (VA), Italy
The first stages of the oxidation of yttrium implanted chromium have been examined using EXAFS at the yttrium and chromium K-edges. Initially a thin chromia layer forms on the surface, and the implanted yttrium rapidly oxidises to form nanocrystallites of yttria. Upon further oxidation some yttrium is incorporated into the chromia scale, probably at the grain boundaries. The local atomic structure around these yttrium ions resembles that of YCrO4.
© EDP Sciences 1997