Zhang, M. and Redfern, S. A. T. and Salje, E. K. H. and Carpenter, M. A. and Hayward, C. (2010) Thermal behaviour of vibrational phonons and hydroxyls of muscovite in dehydroxylation: In situ high temperature infrared spectroscopic investigations. American Mineralogist, 95 (10). pp. 1444-1457. DOI https://doi.org/10.2138/am.2010.3472
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Abstract
Temperature dependencies and thermal dynamical behavior of vibrational phonons related to different bonds/motions (e.g., K-O, Si-O, and Al-O) and O-H stretching, bending, and combinations bands, as well as those of NH4 ions, of muscovite have been investigated in detail at high temperatures using in situ infrared spectroscopy. Phonon modes of muscovite show a complex response to heating and dehydroxylation. The mode Grüneisen parameters of muscovite are largest for low-frequency bands and some bands have negative values. Approaching dehydroxylation, bands associated with K-O stretching, Al-OH bending, and Al-O vibrations exhibit significant variations, indicating modifications of local configurations related to these ions. The O-H stretching feature near 3627 cm–1 shows a change in temperature dependence of the peak position near or during dehydroxylation, and this is attributed to a dramatic loss of OH and changes in local environments. The infrared spectroscopic analyses carried out in situ or on quenched samples do not record the characteristic bands of dehydroxylation-induced H2O and these findings suggest that H2O is unlikely to be the principal diffusing species. The results suggest that de-ammoniation or loss of NH4 in muscovite takes place at temperatures near dehydroxylation.
Item Type: | Article |
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Uncontrolled Keywords: | 2010AREP; IA61; |
Subjects: | 03 - Mineral Sciences |
Divisions: | 03 - Mineral Sciences |
Journal or Publication Title: | American Mineralogist |
Volume: | 95 |
Page Range: | pp. 1444-1457 |
Identification Number: | https://doi.org/10.2138/am.2010.3472 |
Depositing User: | Sarah Humbert |
Date Deposited: | 14 Jul 2010 16:55 |
Last Modified: | 23 Jul 2013 09:57 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/1457 |
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