Abstract
Details of the formation of ZnAl2O4 in the presence of AlF3 was studied for the purpose of elucidating the effect of fluoride anion on the reaction. In the ZnO-AlF3 binary system, sublimation of AlF3 and successive reaction of ZnO with AlF3 vapour were the first route of ZnAl2O4 formation. ZnAl2O4 formation with AlF3 was initiated at the ZnO-AlF3 interface as well as that of the ZnO-AlF3 binary system. This reaction was used to predict the formation of unstable zinc fluoride or zinc oxyfluoride. When the fluoride anions bound with zinc cations were transported to the surface of an Al2O3 particle, the intermediate phase was formed at the site. In addition, the vapour transport of AlF3 to the ZnO-Al2O3 interface was expected to form an intermediate phase containing fluoride anions such as Zn a Al b O x F y phase. The ZnAl2O4 formation was promoted by the material transport through the intermediate phase around Al2O3 particles.
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Hashiba, M., Nurishi, Y. & Hibino, T. Promotion of ZnAl2O4 formation by AlF3 . J Mater Sci 23, 570–576 (1988). https://doi.org/10.1007/BF01174687
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DOI: https://doi.org/10.1007/BF01174687