Mixed-valence vanadium oxides studied by XPS
2000; Elsevier BV; Volume: 454-456; Linguagem: Inglês
10.1016/s0039-6028(00)00111-4
ISSN1879-2758
AutoresM. Demeter, M. Neumann, W. Reichelt,
Tópico(s)Gas Sensing Nanomaterials and Sensors
ResumoWe have investigated several mixed-valence vanadium oxides, single-crystals by X-ray photoelectron spectroscopy (XPS). Many studies have been performed on V2O5, VO2 and V2O3. Less investigated are the mixed-valence compounds, as the V3O5, V4O7 and V6O13 systems, which are discussed here. They exhibit as a function of temperature metal–insulator transitions (MIT). A detailed analysis for these systems, above and below the MIT temperature is given. The core-level spectra for the mixed-valence compounds are compared with those of the related systems, V2O5, VO2 and V2O3 having V5+, V4+ and V3+ ions, respectively. The electronic structures for all investigated oxides are characterized by strong V 3d–O 2p hybridization and they are discussed in relation with similar studies.
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