  Tungsten, a plasma-facing material for future fusion reactors, may be exposed
to air during abnormal operation or accidents. Only limited information is
available on the evolution of related oxide phases. This work addresses the
effect of substrate orientation on structural variations of tungsten oxides.
Annealing experiments in an argon-oxygen atmosphere have been conducted at T =
400 {\deg}C under varying oxygen partial pressure and oxidation time. A
combination of EBSD, Raman spectroscopy and confocal microscopy shows
preferential oxidation initially on {111} base material planes. The oxide scale
changes its phase composition dynamically, influencing the kinetics of its
growth.
