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Journal of Materials Science

, Volume 36, Issue 5, pp 1149–1160 | Cite as

Non-stoichiometry, grain boundary transport and chemical stability of proton conducting perovskites

  • S. M. Haile
  • G. Staneff
  • K. H. Ryu
Article

Abstract

The interrelationship between defect chemistry, non-stoichiometry, grain boundary transport and chemical stability of proton conducting perovskites (doped alkaline earth cerates and zirconates) has been investigated. Non-stoichiometry, defined as the deviation of the A : M molar ratio in AMO3 from 1 : 1, dramatically impacts conductivity, sinterability and chemical stability with respect to reaction with CO2. In particular, alkaline earth deficiency encourages dopant incorporation onto the A-atom site, rather than the intended M-atom site, reducing the concentration of oxygen vacancies. Transport along grain boundaries is, in general, less favorable than transport through the bulk, and thus only in fine-grained materials does microstructure impact the overall electrical properties. The chemical stability of high conductivity cerates is enhanced by the introduction of Zr. The conductivity of BaCe0.9−xZr x M0.1O3 perovskites monotonically decreases with increasing x (increasing Zr content), with the impact of Zr substitution increasing in the order M = Yb → Gd → Nd. Furthermore, the magnitude of the conductivity follows the same sequence for a given zirconium content. This result is interpreted in terms of dopant ion incorporation onto the divalent ion site.

Keywords

Perovskite Chemical Stability Alkaline Earth Zirconium Content Defect Chemistry 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • S. M. Haile
    • 1
  • G. Staneff
    • 1
  • K. H. Ryu
    • 1
  1. 1.Materials ScienceCalifornia Institute of TechnologyPasadenaUSA

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