Phase transformation/stabilization and ionic conductivity in tantalum oxide co-doped zirconia-scandia solid electrolyte

The influence of small amounts of tantalum oxide as co-dopant on phase transformation and stabilization, microstructure and ionic conductivity of zirconia-10 mol% scandia is reported in this work. Cylindrical pellets were prepared by solid state synthesis with sintering at 1500 °C for 5 h. High rela...

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Bibliographic Details
Published in:Ionics 2022-08, Vol.28 (8), p.3919-3926
Main Authors: Souza, J. P., Fujimoto, T. G., Batista, R. M., Steil, M. C., Muccillo, R., Muccillo, E. N. S.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Codopants
Condensed Matter Physics
Dopants
Electrochemistry
Energy Storage
Enthalpy
Ion currents
Optical and Electronic Materials
Original Paper
Partial pressure
Phase transitions
Renewable and Green Energy
Room temperature
Scandium oxides
Solid electrolytes
Specific gravity
Stabilization
Tantalum
Tantalum oxides
Zirconium dioxide
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Summary:The influence of small amounts of tantalum oxide as co-dopant on phase transformation and stabilization, microstructure and ionic conductivity of zirconia-10 mol% scandia is reported in this work. Cylindrical pellets were prepared by solid state synthesis with sintering at 1500 °C for 5 h. High relative density values (> 95%) were achieved. Reduction of the enthalpy for the cubic ⇌ β -rhombohedral phase transformation was found for increasing amounts of the co-dopant. Full stabilization of the cubic structure at room temperature was obtained with only 0.45 mol% tantalum oxide addition. The ionic conductivity of sintered specimens was investigated as a function of the temperature and oxygen partial pressure by impedance spectroscopy. The fully stabilized co-doped system revealed a pure ionic conduction behavior up to 800 °C with wide electrolytic domain. In the 700–800 °C range, the ionic conductivity of co-doped specimens is similar to that of pure zirconia-scandia.
ISSN:0947-7047
1862-0760
DOI:10.1007/s11581-022-04604-5