Thermodynamic Stability of Potassium-beta-Alumina

The thermodynamic stability of K‐beta‐Al2O3 (KBA) has been determined by characterizing the equilibrium between K‐β‐ and K‐β″‐Al2O3 using a potentiometric technique with yttria‐stabilized zirconia (YSZ) as solid electrolyte. The cell allows an in situ check of the establishment and maintenance of th...

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Veröffentlicht in:	Journal of the American Ceramic Society 2005-10, Vol.88 (10), p.2894-2896
Hauptverfasser:	Shqau, Krenar, Näfe, Helfried
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Building materials. Ceramics. Glasses Ceramic industries Chemical industry and chemicals Condensed matter: structure, mechanical and thermal properties Electrotechnical and electronic ceramics Exact sciences and technology Heat capacities of solids Physics Potassium Technical ceramics Temperature Thermal properties of condensed matter Thermal properties of crystalline solids Thermodynamics
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Zusammenfassung:	The thermodynamic stability of K‐beta‐Al2O3 (KBA) has been determined by characterizing the equilibrium between K‐β‐ and K‐β″‐Al2O3 using a potentiometric technique with yttria‐stabilized zirconia (YSZ) as solid electrolyte. The cell allows an in situ check of the establishment and maintenance of the phase equilibrium by changing the composition of the KBA material reversibly. The activity of the potassium oxide dissolved in KBA amounts to (375°–600°C) from which the standard Gibbs free energy of formation of K‐β″‐Al2O3 can be obtained as
ISSN:	0002-7820 1551-2916
DOI:	10.1111/j.1551-2916.2005.00379.x