Oxygen nonstoichiometry and defect chemistry of perovskite-structured SrFe1−xMoxO3−δ solid solutions

O.V. Merkulov, E.N. Naumovich, M.V. Patrakeev, A.A. Markov, Henricus J.M. Bouwmeester, I.A. Leonidov, V.L. Kozhevnikov

Research output: Contribution to journalArticleAcademicpeer-review

27 Citations (Scopus)

Abstract

The oxygen nonstoichiometry ofmixed-conducting perovskite-structured SrFe1−xMoxO3−δ (x=0, 0.07, 0.15 and 0.25) was measured by oxygen coulometric titration in the range of oxygen partial pressure 10−20–0.5 atm and temperature 800–950 °C. Based upon a defect chemical analysis of the non-stoichiometry data it is shown that significant reduction of Mo6+ occurs under reducing conditions. The trend observed in the oxidation enthalpy suggests a weakening of the Fe\\O bond strength along with the degree of substitution of Fe by Mo, which behavior is consistent with the concomitant increase in lattice constant. Atomistic simulations were carried out to support the defect chemical analysis, showing that the Mo cations in SrFe1−xMoxO3−δ retain a full, 6-fold coordination shell, whilst Fe cations can have 0, 1 or 2 oxygen vacancies in the first coordination shell.
Original languageEnglish
Pages (from-to)116-121
JournalSolid state ionics
Volume292
DOIs
Publication statusPublished - 2016

Keywords

  • IR-100463
  • METIS-316961

Fingerprint Dive into the research topics of 'Oxygen nonstoichiometry and defect chemistry of perovskite-structured SrFe1−xMoxO3−δ solid solutions'. Together they form a unique fingerprint.

Cite this