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Thermodynamic properties of iron doped beta″-alumina by e.m.f. measurements with beta-alumina electrolytes

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Abstract

Thermodynamic studies of the non-stoichiometric iron doped beta″-alumina (IDβ″) phase were carried out by electrochemical measurements coupled with coulometric titration using the cell Naliq/Liβ″-alumina/IDβ″. Hot pressing and glass sealing techniques were developed and employed to obtain a suitable and stable Liβ″-alumina/IDβ″ interface. The equilibrium e.m.f. of the cell was determined as a function of sodium concentration over the temperature range 444 to 523 K. The range of sodium concentrations over which the IDβ″ phase is stable was also determined. The relative partial molar thermodynamic quantities of sodium,\(\overline {\Delta G} _{Na} \),\(\overline {\Delta H} _{Na} \), and\(\overline {\Delta S} _{Na} \) in IDβ″ alumina as a function of sodium concentration were obtained from cell e.m.f. data.

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Authors and Affiliations

  1. Institute of Electronics, National Chiao-Tung University, Hsinchu, Taiwan

    T. Y. Tseng

  2. Purdue University, 47907, West Lafayette, Indiana, USA

    R. W. Vest

Authors
  1. T. Y. Tseng
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  2. R. W. Vest
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Tseng, T.Y., Vest, R.W. Thermodynamic properties of iron doped beta″-alumina by e.m.f. measurements with beta-alumina electrolytes. J Mater Sci 23, 2387–2393 (1988). https://doi.org/10.1007/BF01111893

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  • DOI: https://doi.org/10.1007/BF01111893

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