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Processing of yttrium-doped barium zirconate for high proton conductivity

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Abstract

The factors governing the transport properties of yttrium-doped barium zirconate (BYZ) have been explored, with the aim of attaining reproducible proton conductivity in well-densified samples. It was found that a small initial particle size (50–100 nm) and high-temperature sintering (1600 °C) in the presence of excess barium were essential. By this procedure, BaZr0.8Y0.2O3−δ with 93% to 99% theoretical density and total (bulk plus grain boundary) conductivity of 7.9 × 10−3 S/cm at 600 °C [as measured by alternating current (ac) impedance spectroscopy under humidified nitrogen] could be reliably prepared. Samples sintered in the absence of excess barium displayed yttria-like precipitates and a bulk conductivity that was reduced by more than 2 orders of magnitude.

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Authors and Affiliations

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

    Peter Babilo, Tetsuya Uda & Sossina M. Haile

  2. Materials Science and Engineering, Kyoto University, Kyoto, Japan, 606-8501

    Tetsuya Uda

Authors
  1. Peter Babilo
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  2. Tetsuya Uda
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  3. Sossina M. Haile
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Correspondence to Sossina M. Haile.

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Babilo, P., Uda, T. & Haile, S.M. Processing of yttrium-doped barium zirconate for high proton conductivity. Journal of Materials Research 22, 1322–1330 (2007). https://doi.org/10.1557/jmr.2007.0163

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  • DOI: https://doi.org/10.1557/jmr.2007.0163

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