Abstract
A qualitative investigation of CaO single crystal and hot-pressed polycrystal behaviour in high K2O melts is presented. Under carefully controlled anhydrous conditions, no intermediate crystalline compound was detected at temperatures up to 800° C. Calcium oxide dissolves preferentially along grain boundaries and/or along 〈1 0 0〉 directions on {1 0 0} faces. The melt viscosity gradually increases with its CaO content. The single crystal corrosion rate, therefore, decreases with time and a protective glassy layer may eventually develop on its surface.
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Supplied by Cristal-Tec, Grenoble, France.
Prepared by calcination of CaCO3, Prolabo, Paris, France.
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Cassou, M., Mocellin, A. Observation of CaO corrosion by K2O melts. J Mater Sci 12, 909–914 (1977). https://doi.org/10.1007/BF00540972
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DOI: https://doi.org/10.1007/BF00540972