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Processing of yttrium-doped barium zirconate for high proton conductivity

Published online by Cambridge University Press:  03 March 2011

Peter Babilo ,
Tetsuya Uda  and
Sossina M. Haile
Peter Babilo
Affiliation:
Materials Science, California Institute of Technology, Pasadena, California 91125
Tetsuya Uda
Affiliation:
Materials Science, California Institute of Technology, Pasadena, California 91125; and Materials Science and Engineering, Kyoto University, Kyoto, Japan 606-8501
Sossina M. Haile*
Affiliation:
Materials Science, California Institute of Technology, Pasadena, California 91125
*
a) Address all correspondence to this author. e-mail: smhaile@caltech.edu
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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.

Keywords

CeramicIonic conductorSintering
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 5 , May 2007 , pp. 1322 - 1330
Copyright
Copyright © Materials Research Society 2007

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