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High oxygen ion conduction in sintered oxides of the Bi2O3-Er2O3 system

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Abstract

The phase diagram of the Bi2O3-Er2O3 system was investigated. A monophasic f c c structure was stabilized for samples containing 17.5–45.5 mol% Er2O3. Above and below this concentration range polyphasic regions appear. The f c c phase showed high oxygen ion conduction. The ionic transference number is equal to one for specimens containing 30 mol% Er2O3 or less, while an electronic component is introduced at low temperatures for specimens containing 40–60 mol% Er2O3. Between 673 K and 873 K a maximum in the conductivity was found at 20 mol% Er2O3. (Bi2O3)0.8.(Er2O3)0.20 is found to be the best oxygen ion conductor so far known. The conductivity at 773 K and 973 K is 2.3 Ω−1m−1 and 37 Ω−1 m−1 respectively. These values are 2–3 times higher than the best oxygen ion conductor reported for substituted Bi2O3 systems and 50–100 times higher than those of stabilized zirconia (ZrO2)0.915(Y2O3)0.085 at corresponding temperatures.

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Authors and Affiliations

  1. Department of Inorganic Materials Science, Twente University of Technology, PO Box 217, 7500, AE Enschede, The Netherlands

    M. J. Verkerk, K. Keizer & A. J. Burggraaf

Authors
  1. M. J. Verkerk
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  2. K. Keizer
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  3. A. J. Burggraaf
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Verkerk, M.J., Keizer, K. & Burggraaf, A.J. High oxygen ion conduction in sintered oxides of the Bi2O3-Er2O3 system. J Appl Electrochem 10, 81–90 (1980). https://doi.org/10.1007/BF00937342

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