Electronic structure of the monoclinic and hexagonal trioxides of tungsten and hexagonal hydrogen tungsten bronze H0.24WO3

Abstract

The methods of x-ray photoelectron spectroscopy (XPS) and x-ray emission spectroscopy (XES) were used to study the electronic structure of the monoclinic and hexagonal modifications of WO3, as well as hexagonal hydrogen tungsten bronze H0.24WO3. The OKα emission bands and the XPS spectra of the valence and core electrons were obtained for all of the compounds. It is shown that the half-width of the OKα bands and the XPS spectra of the valence electrons increase in the modification sequence WO3 → hexagonal WO3 → H0.24WO3. The near-Fermi region of the XPS valence-electron spectrum of the compound H0.24WO3 was found to contain an additional subband that is absent from both modifications of WO3. It was established that, within the experimental error, the binding energies of the W4f and O1s core electrons remain constant for all of the compounds that were studied.