IR spectra of VO2 and V2O3

Oxidation of vanadium metal in oxygen plasma and their characterizations

“…8), shows the presence of monoclinic phase of VO 2 on vanadium metal. 21 The IR spectrum of sample V1 shows that all IR peaks are very less intense and the peak positioned particularly at 640 cm −1 corresponds to VO 2 phase is absent, which shows the presence of single orthorhombic phase with lesser oxidation. There are two additional peaks at 1625 and 1460 cm −1 in all samples, confirmed the presence of water molecules on the V surface corresponding to the bending mode of hydroxyl group (-OH).…”

Studies on the Interaction of Vanadia with Modified Silica Supports and Catalytic Activity for Oxidative Dehydrogenation of Propane: Effect of Support Modification by Al3+, Zr4+ or Y3+

“…The IR spectra of reduced V 2 O 5 also show a similar effect in the V=O stretching vibration due to the V IV species, the ionic radius of which is larger than V V . [17] In the case of the SZ and SY samples, it can be seen that the band around 1091 cm -1 is very broad compared with that in SiO 2 and this is due to the distortion of the Si-OSi bond brought about by the substitution. However, in the case of VSZ and VSY, a shift in this band to a slightly higher frequency can be observed.…”

“…The band at 1020 cm -1 corresponds to the unshared V=O stretching vibration and the bands located around 810, 472 and 364 cm -1 can be assigned to the vibrations of the bound oxygen which are shared by two vanadium atoms. [17,18] The IR spectrum of silica mainly shows three broad bands centred at 1091, 808 and 470 cm -1 which can be assigned to the Si-O stretching (antisymmetric stretching of the type ǟSi OǞ ǟSi), Si stretching (symmetric stretching mode of type ǟSi O SiǞ) and Si-O-Si bending of the characteristic groups, respectively. [19,20] Since the peak positions of both V 2 O 5 and SiO 2 are close, they overlap and hence IR bands due to V 2 O 5 cannot be seen in vanadia impregnated samples.…”

Phase evolution of vanadium oxides obtained through temperature programmed calcinations of ammonium vanadate in hydrogen atmosphere and their humidity sensing properties

“…The observed absorption shoulder at 715 cm -1 and strong peak at 972 cm -1 are correspond to the VO 2 [45], The shoulder at 715cm -1 was not observe for higher temperature where p and p 0 are the equilibrium and saturation pressure of adsorbate at the temperature of adsorption, ѵ is the adsorbed gas quantity, v m is the monolayer adsorbed gas quantity and c is the BET constant. fig.…”