Electronic structure of both monoclinic and hexagonal tungsten trioxides and of the hexagonal hydrogen tungsten bronze H{sub}0.24WO{sub}3

摘要

X-Ray photoelectron (XPS) and emission (XES) spectroscopy methods are used to study the electronic structure of both monoclinic and hexagonal modifications of WO{sub}3 as well as of the hexagonal hydrogen tungsten bronze H{sub}0.24WO{sub}3. The XPS spectra of both valence and core-level electrons as well as the 0 Kα XES spectra for the mentioned compounds are derived. Half-widths of both the 0 Kα bands and the XPS valence-band spectra increase in the sequence monoclinic WO{sub}3→ hexagonal WO{sub}3→H{sub}0.24WO{sub}3. Creation of an additional near-Fermi subband which is absent in the both modifications of WO{sub}3 has been detected on the XPS valence-band spectrum of H{sub}0.24WO{sub}3. It has been established that, binding energies of the both W4f and O1s care-level electrons remain constant (within the experimental error) for all the compounds studied.