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Enhanced oxide ion conductivity in stabilized delta-Bi2O3.
Rita Punn1, Antonio M Feteira, Derek C Sinclair
1School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, UK.
Journal of the American Chemical Society
|November 30, 2006
Summary
New rhenium-substituted bismuth oxide (Bi2O3) materials with lanthanide ions exhibit high oxide ion conductivity. These novel delta-Bi2O3 phases offer potential for advanced electrochemical applications.
Area of Science:
- Solid-state chemistry
- Materials science
- Electrochemistry
Background:
- Bismuth oxide (Bi2O3) is known for its potential in solid oxide fuel cells.
- Stabilizing the high-conductivity delta-Bi2O3 phase at lower temperatures remains a challenge.
Purpose of the Study:
- To investigate the stabilization of the delta-Bi2O3 structure.
- To explore the oxide ion conductivity of novel substituted phases.
Main Methods:
- Solid-state synthesis of rhenium- and lanthanide-substituted Bi2O3.
- Structural characterization using X-ray diffraction.
- Electrochemical impedance spectroscopy to measure ionic conductivity.
Main Results:
- Successfully synthesized novel delta-Bi2O3 phases with compositions like Bi12.5La1.5ReO24.5.
- Observed exceptionally high oxide ion conductivity (approx. 10-3 S cm-1 at 300°C).
- Identified significant structural deviations from ideal fluorite positions in interstitial anion sites.
Conclusions:
- Rhenium and lanthanide co-substitution effectively stabilizes the delta-Bi2O3 phase.
- These novel materials demonstrate promising ionic conductivity at reduced operating temperatures.
- The unique structural features are linked to the enhanced ion transport properties.
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