Abstract
The in-situ formation of layers consisting of β′'-alumina on high purity polycrystalline α-alumina substrates was investigated. The direct synthesis of sodium and potassium β′'-alumina layers was possible in a mixture of uncalcined powders of stoichiometries close to the β′'-alumina phase in a temperature-time window between 1200 and 1400 °C and 1 h to 12 h.
These materials were employed for ion exchange processes in order to obtain Li+, H3O+ and Ca2+-β′'-alumina modifications, which could not be synthesized by the direct method. The resulting materials were characterized by SEM/EDX, XRD, DTA and IS.
The obtained β′'-alumina layers show the same properties as polycrystalline monolithic ceramics but are available as thin films of thicknesses between 4 and 25 µm on insulating, well defined substrate materials.
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Schäf, O., Widmer, T. & Guth, U. In-situ formation of thin-film like β′'-alumina layers on α-alumina substrates. Ionics 3, 277–281 (1997). https://doi.org/10.1007/BF02375629
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DOI: https://doi.org/10.1007/BF02375629