| Chemical Stability and Electrical Conductivity of
Ba0.8Ce0.85-xZrxTb0.15O3-Proton Conductors with
ZnO as Sintering Aid |
Quazi Arif Islam, Sourav Nag and Rajendra Nath Basu*
pages : 25-32
DOI : 10.1080/0371750X.2015.1136238 |
| Abstract |
| The chemical stability of Ba0.8Ce0.85-xZrxTb0.15O3- (0.10.5) has been studied in
dry 5% H2/Ar, wet 5% H2/Ar and dry CO2 atmosphere at higher temperature.
These materials are promising candidates for mixed ionic electronic conductor
based H2 separation membrane. The materials are prepared by combustion
synthesis technique successively followed by calcination at 1100oC and sintering
at 1550oC in air. The stabilization mechanism of sintered specimens in various
atmospheres is explained with respect to the combined effect of zirconium
oxide and zinc oxide as stabilizing agent and sintering aid respectively. Zr4+
introduction into Ce4+ site of doped barium cerate perovskite enhances the
chemical stability of these materials, particularly for the composition with
x>0.3. The stable sintered material is obtained with total electrical conductivity
of 0.0189 S.cm–1 for the composition Ba0.8Ce0.35Zr0.5Tb0.15O3- in moist reducing
atmosphere at 900oC. So, in the present work, we report a composition which
shows excellent stability in pure CO2 atmosphere at high temperature without
much compromising its ionic conductivity.
[Keywords: Ceramics, Proton conductor, Stability, Defects, Ionic conductivity] |
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