Abstract
Single phase sodiumβ-alumina solid electrolyte was found to undergo isothermal phase separation in electrochemical cells, where a large oxygen potential gradient was imposed across the electrolyte and electrodes, not reversible to sodium ions, were short circuited. The experimental conditions and evidence of decomposition are outlined and a thermodynamic explanation for the phenomenon is given. This finding may lead to new methods for making multi-layered ceramic materials involving ionic conductors.
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K. T. Jacob and O. M. Sreedharan, unpublished research.
D. R. Stull and H. Prophet et al., JANAF Thermochemical Tables, NSRDS-NBS 37, US Department of Commerce, Washington, DC, USA.
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Jacob, K.T. Decomposition of β-alumina in an oxygen potential gradient. J Appl Electrochem 13, 469–472 (1983). https://doi.org/10.1007/BF00617521
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DOI: https://doi.org/10.1007/BF00617521