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SrZrO3-based proton conducting materials with La additions

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Abstract

The behaviour of La-containing strontium zirconate based ceramics is revised. La additions contribute to improve the sinterability of these materials, but transport properties are also affected. Sr1−xLaxZrO3+δ show some unusual changes in transport properties when samples are exposed to H2-containing atmospheres and then reoxidized. Nevertheless, the transport properties of (Sr,La)(Zr,Y)O3−δ, are still mainly dependent on Y additions, at least for cases when the fraction of Y exceeds the fraction of La. In addition, lanthanum causes significant changes in lattice parameters. A combination of conductivity measurements in different atmospheres, ion blocking experiments, and emf measurements has been used to demonstrate that electron hole conductivity increases with temperature, and the protonic contribution drops. The transport properties at temperatures lower than about 800 °C might be affected by structural changes.

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Authors and Affiliations

  1. ESTG, Instituto Politécnico de Viana do Castelo, Apart.51, 4900, Viana do Castelo, Portugal

    A. A. L. Ferreira & B. Gharbage

  2. Departamento de Engenharia Cerâmica e do Vidro, Universidade de Aveiro, 3810, Aveiro, Portugal

    J. A. Labrincha & J. R. Frade

Authors
  1. A. A. L. Ferreira
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  2. B. Gharbage
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  3. J. A. Labrincha
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  4. J. R. Frade
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Ferreira, A.A.L., Gharbage, B., Labrincha, J.A. et al. SrZrO3-based proton conducting materials with La additions. Ionics 1, 474–481 (1995). https://doi.org/10.1007/BF02375293

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  • DOI: https://doi.org/10.1007/BF02375293

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