Abstract
KAOLINITE and halloysite in the temperature-range 650–900° C. do not show any pronounced X-ray interference. In this range metakaolinite is formed; its Si—O hexagonal network remains more or less unchanged, while the octahedral sheet is deformed in absence of OH-groups1,2. In kaolinite and halloysite, dehydration brings about a random arrangement in the direction of the c-axis. In pure and perfectly crystallized kaolinite, heated in the differential thermal apparatus at a velocity of 10 deg. C. per min. just above the exothermal maximum, X-ray examination reveals γA12O3 and mullite, whereas in halloysite only γ-alumina appears. In halloysite heated in the same way, mullite is observed3 only above 1,100° C. As the X-ray diagrams of mullite and sillimanite resemble each other closely, it is not certain which of these two phases is formed during the heating of kaolinite and halloysite.
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Brindley, G. W., Min. Mag., 30, 574 (1955).
Roy, R., Roy, D. M., and Francis, E. E., J. Amer. Ceram. Soc. 38, 198 (1955).
Glass, H. D., Amer. Mineral., 39, 193 (1954).
Hunt, John M., Wisherd, Mary P., and Bonham, Lawrence C., Anal. Chem., 22, 1478 (1950).
Roy, R., and Francis, E. E., Amer. Mineral., 38, 725 (1953).
de Boer, J. H., and Houben, G. M. M., Proc. Int. Symp. React. Solids, 1952, p. 237.
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STUBIČAN, V., GÜNTHARD, H. Infra-red Spectra of High-temperature Phases of Kaolinite and Halloysite. Nature 179, 542 (1957). https://doi.org/10.1038/179542a0
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DOI: https://doi.org/10.1038/179542a0
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