Soft X-ray absorption spectroscopy study of (Ba0.5Sr0.5) (Co0.8Fe0.2)1-xNbxO3-δ with different content of Nb (5%-20%)

Y.V. Egorova*, T. Scherb, G. Schumacher, H.J.M. Bouwmeester, E.O. Filatova

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)
7 Downloads (Pure)


The mixed electronic ionic conducting materials (Ba0.5Sr0.5) (Co0.8Fe0.2)1-xNbxO3-δ with partial Nb substitution (x: 0.05, 0.10, 0.15, 0.20) for B cations (Co/Fe), synthesized using a solid state reaction method, have been studied by near edge X-ray absorption fine structure (NEXAFS). Co L2,3- absorption spectra of (Ba0.5Sr0.5) (Co0.8Fe0.2)1-xNbxO3-δ (BSCFN) powders were analyzed with the purpose to understand the influence of the Nb substitution on the atomic electronic structure of BSCFN. The joint analysis of the Co L2,3- absorption spectra reveals the presence of mixed oxidation states Co2+/Co3+ in all the studied BSCFN structures. It was established that the proportion of oxidation states Co2+/Co3+ and the corresponding coordinations of Co atoms depend on the content of Nb. In the 10% Nb substituted BSCF sample Co atoms mostly occur in the Co2+ oxidation state and are preferentially characterized by an octahedral coordination site. In all other structures Co atoms are rather characterized by Co2+/Co3+ oxidation states and occupy both octahedrally and tetrahedrally coordinated sites.

Original languageEnglish
Pages (from-to)848-852
Number of pages5
JournalJournal of alloys and compounds
Publication statusPublished - 22 Aug 2015


  • Local bonding environment
  • Microstructure
  • Near edge X-ray absorption fine structure
  • Solid oxide fuel cell
  • 2023 OA procedure

Cite this