X-ray photoelectron and mössbauer spectroscopy studies of the valence state of transition metal ions in Co1–xFexCr2O4 (x = 0.1, 0.2, 0.5) ceramics

Resumo

The valence state of transition metal ions in the Co_1–xFe_xCr₂O₄ (x = 0.1, 0.2, 0.5) system has been investigated using X-ray photoelectron and Mössbauer spectroscopy. It has been shown that, in this system, there are Fe²⁺ and Fe³⁺ ions. The relative Fe³⁺/Fe²⁺ contents have been determined by fitting the experimental Fe 2p photoelectron spectra by a superposition of theoretical spectra of the Fe²⁺ and Fe³⁺ ions, as well as using Mössbauer spectroscopy.