Influence of Y-substitution on phase composition and proton uptake of self-generated Ba(Ce,Fe)O 3−δ–Ba(Fe,Ce)O 3−δ composites

Christian Berger, Edith Bucher, Rotraut Merkle*, Christina Nader, Judith Lammer, Werner Grogger, Joachim Maier, Werner Sitte*

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

Self-generated composites from the series BaCe1(x+z)FexYzO3d with z ¼ 0.2 for 0.1 # x # 0.6 and z ¼ 0 forCe : Fe ¼ 1 were obtained by one-pot synthesis. The composites consist of proton and electron conductingphases and are interesting as electrode materials for protonic ceramic fuel and electrolyser cells. X-raydiffraction with quantitative phase analysis and scanning electron microscopy with energy-dispersiveX-ray spectroscopy showed that the materials consist of Fe-rich phases and a Ce-rich perovskite phase,which are present in the corresponding proportion depending on the precursor composition (Ce–Feratio). Substitution with Y leads to a narrowing of the miscibility gap compared to BaCe1xFexO3dcomposites, thus favouring transformation of the composites into single cubic phases at temperaturesabove 1000 C. Further, Y influences the mutual solubility of Fe3+/4+ and Ce4+ in the Ce-rich and Fe-richphase, respectively, as shown elemental mapping via scanning transmission electron microscopy. As onlya small proportion of the Y dissolves in the electrolyte-type phase, the increased proton uptake resultingfrom the incorporation of Y in the Ce-rich phase is limited. Strategies to overcome this limitation bysubstitution with ions with similar ionic radii, but different basicity, are discussed.
Originalspracheenglisch
Seiten (von - bis)2474-2482
Seitenumfang9
FachzeitschriftJournal of Materials Chemistry A
Jahrgang10
Ausgabenummer5
DOIs
PublikationsstatusVeröffentlicht - 7 Feb. 2022

ASJC Scopus subject areas

  • Allgemeine Materialwissenschaften

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

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