EVIDENCE OF MIXED-VALENCY CHARACTER IN THE X-RAY PHOTOELECTRON SPECTRA OF α-DIANTIMONY TETRAOXIDE AND BARIUM BISMUTH TRIOXIDE

TLDR: In this article, the X-ray photoelectron spectra of α-Sb2O4 and BaBiO3 were analyzed and the mixed-valency character of these oxides was found only after careful pretreatment of the samples in situ.

Abstract: X-Ray photoelectron spectra of the metal(III)–metal(V) oxides α-Sb2O4 and BaBiO3 are reported. Indications of ‘mixed-valency’ character in the metal core-electron spectra could be found only after careful pretreatment of the samples in situ. Under normal conditions both compounds appear to have surface phases containing just the lower oxidation state.