Abstract
NUMEROUS investigations have been made of the thermal behaviour of alumina–boric oxide mixtures. In 1887 Mallard1 identified a compound believed to be 3Al2O3.B2O3. Later work by Baumann and Moore2 and by Scholze3 indicated the formula to be 9Al2O3.-2B2O3. Scholze3 reported an additional compound, 2Al2O3.B2O3. A third boroaluminate has been recognized as the rare mineral jeremejevite, Al2O3.B2O3 (ref. 4). Data on the stability of these compounds are conflicting, and no serious effort appears to have been made to incorporate them in a conventional phase diagram. We present here a tentative phase diagram for the system Al2O3–B2O3, based on data from more than 100 runs carried out in the range 600°–1,650° C.
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References
Mallard, E., C.R. Acad. Sci., Paris, 105, 1260 (1887).
Baumann, jun., H. N., and Moore, jun., C. H., J. Amer. Ceram. Soc., 25, 391 (1942).
Scholze, H., Z. anorg. allgem. Chem., 284, 272 (1956).
Palache, C., Berman, H., and Frondel, C., in Dana's System of Mineralogy, seventh ed., 2, 330 (Wiley, New York, 1951).
Michel-Levy, M., C.R. Acad. Sci., Paris, 228, 1814 (1949).
Golovastikov, N. I., Belova, E. N., and Belav, N. V., Dokl. Akad. Nauk S.S.S.R., 104, 78 (1955).
Foex, M., C.R. Acad. Sci., Paris, 206, 349 (1938).
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GIELISSE, P., FOSTER, W. The System Al2O3–B2O3. Nature 195, 69–70 (1962). https://doi.org/10.1038/195069a0
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DOI: https://doi.org/10.1038/195069a0
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