Reactivity of some vanadium oxides: An EPR and XRD study

XRD diffraction patterns of VO2 (Aldrich): (a) fresh sample, (b) after 26 months, (c) after 95 months, (d) after 95 months and thermal treatment at 383 K in air, and (c) after 95 months and thermal treatment at 383 K in sealed glass tube.