The kinetics of structural changes of Ti-W oxide thin films has been s
tudied by X-ray diffraction and Raman spectroscopy. The XRD patterns w
ere measured after each annealing treatment. As the number of annealin
g treatments increased, a progressive ordering of the as-grown amorpho
us film was observed by XRD and confirmed by Raman measurements. An ex
planation of the ordering is given in terms of segregation of Ti impur
ities at the surface.