IR-SPECTRA OF VO2 AND V2O3

IR spectra of the tetragonal modification of VO2 and of the trigonal f orm of V2O3 are recorded at room temperature and compared with that of V2O5. The investigated samples of the two lower-valent vanadium oxide s, obtained on temperature-programmed reduction treatment, were also c haracterized with diffuse reflectance and electron-paramagnetic resona nce spectra. The effect of atmospheric oxygen on these materials was r evealed with XPS measurements and also studied with IR spectra. (C) 19 97 Elsevier Science S.A.