The influence of composition and fine structure on a thermographical characteristics of micas |
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| Authors: | I. L. Lapides |
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| Affiliation: | (1) Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel |
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| Abstract: | Several isomorphic groups of micas: Muscovite-Phengite-Muscovite-Li-Muscovite; Biotite-Zinnwaldite-Lepidolite and Biotite-Phlogopite were investigated by DTA, TG and DTG. Octehedral vacancies and the sites of octahedral cationic occupancy were determined from IR-spectra of the hydroxyls. The influence of a composition and fine structure of the micas on the shape of the thermal curves was discussed. A one to one correspondence between the isomorphic series members and individual thermal curves makes it possible to determine the chemical composition of a mica sample. The combination of thermal and IR-spectra of hydroxyl analyses permits to link the Order-Disorder data with thermal properties of mica. Dedicated to Professor Lisa Heller-Kallai on the occasion of her 65th birthday |
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| Keywords: | biotite IR spectra lepidolite mica muscovite octahedral vacancy octahedral cation occupation phlogopite thermal analysis |
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