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

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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−x Zr 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.

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Authors and Affiliations

  1. Materials Science, California Institute of Technology, Pasadena, CA, 91125, USA

    S. M. Haile, G. Staneff & K. H. Ryu

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  1. S. M. Haile
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  2. G. Staneff
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  3. K. H. Ryu
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Haile, S.M., Staneff, G. & Ryu, K.H. Non-stoichiometry, grain boundary transport and chemical stability of proton conducting perovskites. Journal of Materials Science 36, 1149–1160 (2001). https://doi.org/10.1023/A:1004877708871

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