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Processing of yttrium-doped barium zirconate for high proton conductivity

Babilo, Peter and Uda, Tetsuya and Haile, Sossina M. (2007) Processing of yttrium-doped barium zirconate for high proton conductivity. Journal of Materials Research, 22 (5). pp. 1322-1330. ISSN 0884-2914.

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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-d 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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Haile, Sossina M.0000-0002-5293-6252
Additional Information:© 2007, Materials Research Society (Received 4 May 2006; accepted 25 January 2007) Funding for this work was provided by the United States Department of Energy through the National Energy Technology Laboratory, Office of Fossil Fuels (DE-FC26-02NT41631). Additional support was provided by the United States National Science Foundation (DMR-0080065) through Caltech’s Center for the Science and Engineering of Materials, an NSF Materials Research Science and Engineering Center (MRSEC).
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Department of Energy (DOE)DE-FC26-02NT41631
Issue or Number:5
Record Number:CaltechAUTHORS:BABjmr07
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8097
Deposited By: Archive Administrator
Deposited On:30 Jul 2007
Last Modified:02 Oct 2019 23:48

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