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Issue 39, 2010
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Characterisation of lower temperature sintered zinc-doped barium calcium niobate proton conducting electrolytes

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Abstract

The densification of Ba3Ca1.18Nb1.82O8.73 (BCN18) at 1325 °C has been improved by the addition of ZnO, resulting in the new proton conducting material, Ba3(Ca1.18Nb1.70Zn0.12)O8.55 (BCNZ18). As for Ba3Ca1.18Nb1.82O8.73, Ba3(Ca1.18Nb1.70Zn0.12)O8.55 is found to be a mixed conductor; with both electronic and ionic conductivity under different atmospheres. By increasing the sintered density of Ba3(Ca1.18Nb1.70Zn0.12)O8.55, the total conductivity has increased by decreasing the grain boundary contribution. Once the sample is hydrated under wet 5% H2/Ar, Ba3(Ca1.18Nb1.70Zn0.12)O8.55 behaves as a pure ionic conductor below 550 °C, due mainly to proton conduction. At 500 °C the value of conductivity measured for Ba3(Ca1.18Nb1.70Zn0.12)O8.55 under 5% H2/Ar was 7.32 × 10−4 S cm−1. Overall, this material has shown to be a promising electrolyte material for high temperature electrochemical devices.

Graphical abstract: Characterisation of lower temperature sintered zinc-doped barium calcium niobate proton conducting electrolytes

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Article information


Submitted
27 Apr 2010
Accepted
22 Jul 2010
First published
31 Aug 2010

J. Mater. Chem., 2010,20, 8506-8511
Article type
Paper

Characterisation of lower temperature sintered zinc-doped barium calcium niobate proton conducting electrolytes

H. D. A. L. Viana and J. T. S. Irvine, J. Mater. Chem., 2010, 20, 8506
DOI: 10.1039/C0JM01230K

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