H2O and the dehydroxylation of phyllosilicates: an infrared spectroscopic study

Zhang, M. and Redfern, S. A. T. and Salje, E. K. H. and Carpenter, M. A. and Wang, L.ing (2010) H2O and the dehydroxylation of phyllosilicates: an infrared spectroscopic study. American Mineralogist, 95 (11). pp. 1686-1693. DOI https://doi.org/10.2138/am.2010.3561

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As shown by in situ infrared spectroscopy and analysis of quenched samples, phyllosilicates (muscovite, sericite, pyrophyllite, and talc) under dehydroxylation conditions lack the characteristic bands near 1600 cm–1 (bending) and 5200 cm–1 (combination) of H2O, and they contain virtually no H2O but an abundance of OH. This observation appears to be at variance with the formal description of dehydroxylation in bulk samples as 2(OH) -> H2O + O, whereas it is suggested that hydrogen diffuses in the form of (OH) – or/and H+ in dehydroxylation. The upper limit of H2O in the dehydroxlated bulk is likely to be at the parts per million level in phyllosilicates that contain structural OH ions equivalent to 4–5 wt% H2O. The observations suggest that H2O molecules are probably formed near the surface of the sample.

Item Type: Article
Uncontrolled Keywords: 2010AREP; IA61;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: American Mineralogist
Volume: 95
Page Range: pp. 1686-1693
Identification Number: https://doi.org/10.2138/am.2010.3561
Depositing User: Sarah Humbert
Date Deposited: 14 Jul 2010 16:58
Last Modified: 23 Jul 2013 09:57
URI: http://eprints.esc.cam.ac.uk/id/eprint/1458

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