Abstract
The thermodynamics of oxygen intercalation in strontium ferrite SrFe2.5+δ is studied by means of the coulometric titration technique. The analysis of the oxygen concentration dependent behavior of partial thermodynamic functions reveals inhomogeneous architecture of the ferrite, which can be viewed as consisting of microscopic brownmillerite-like domains intergrown with perovskite-like structural fragments. The oxygen vacancies are mainly located in the brownmillerite-like domains. The oxygen intercalation results in a gradual increase of the perovskite-like fragments and delocalization of the hole carriers. The changes in conductivity and thermopower with oxygen content can satisfactorily be explained in frameworks of a small-polaron conduction model.
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Patrakeev, M.V., Shilova, J.A., Mitberg, E.B., Lakhtin, A.A., Leonidov, I.A., Kozhevnikov, V.L. (2002). Oxygen Intercalation in Strontium Ferrite: Evolution of Thermodynamics and Electron Transport Properties. In: Julien, C., Pereira-Ramos, J.P., Momchilov, A. (eds) New Trends in Intercalation Compounds for Energy Storage. NATO Science Series, vol 61. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0389-6_50
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DOI: https://doi.org/10.1007/978-94-010-0389-6_50
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