Investigation of the Alkali-Metal Vanadium Oxide Xerogel Bronzes: AxV2O5.cntdot.nH2O (A = K and Cs)

Morphological Evolution of (NH4)0.5V2O5·mH2O Fibers into Belts, Triangles, and Rings

“…The presence of ammonium ions may introduce attractive electrostatic forces between the vanadium oxide layers, which is in good agreement with what has been reported in the literature. 35,36 The FTIR spectrum of the as-prepared sample is shown in Figure 2A. The band centered at 981 cm À1 is assigned to VdO stretching vibration, which is sensitive to intercalation and suggests that NH 4 + ions are inserted between the vanadium oxide layers, in full agreement with previous results.…”

“…The band centered at 981 cm À1 is assigned to VdO stretching vibration, which is sensitive to intercalation and suggests that NH 4 + ions are inserted between the vanadium oxide layers, in full agreement with previous results. 36 The splitting of this 981 cm À1 band into two absorption peaks Inorganic Chemistry ARTICLE (965 and 996 cm À1 ) as compared to standard V 2 O 5 (∼1020 cm À1 ) arises from the formation of two inequivalent VdO groups. 16 The bands at 965 and 996 cm À1 are respectively assigned to the VdO stretching of distorted octahedral and distorted square pyramids.…”

Study of optical properties of highly oriented nanocrystalline V2O5·nH2O films doped with K ions

“…The relevance of the O-2p bands is that they provide a path for virtual hopping process between the V sites. The coupling between V sites is through virtual hopping via p-bonded O-2p y states [9]. These observations are consistent with the fact that these absorption bands are electronic d-d transitions associated with V 4?…”

XAS investigation on polyvalent cation intercalation in V2O5 aerogels

“…5 sheets further sandwiched by two layers of apical oxygens (one oxygen per VOLs in each layer). Both proposed models satisfy the observed X-ray diffraction data in the reflection mode, i.e., the OOl class of reflections (Liu et al 1995). Although the second model appears to give a more accurate estimation of the material density (Yao et al 1992), some uncertainty on the gel-based V205 structure remains.…”