Articles | Volume 32, issue 5
Eur. J. Mineral., 32, 469–482, 2020
https://doi.org/10.5194/ejm-32-469-2020
Eur. J. Mineral., 32, 469–482, 2020
https://doi.org/10.5194/ejm-32-469-2020

Research article 18 Sep 2020

Research article | 18 Sep 2020

In situ micro-FTIR spectroscopic investigations of synthetic ammonium phengite under pressure and temperature

Nada Abdel-Hak et al.

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Cited articles

Bentabol, M. and Cruz, M. D. R.: NH4 for K substitution in dioctahedral mica sythesized at 200 C, Appl. Clay Sci., 126, 268–277, https://doi.org/10.1016/j.clay.2016.03.025, 2016. 
Beran, A., Voll, D., and Schneider, H.: IR spectroscopy as a tool for the characterisation of ceramic precursor phases, in: Spectroscopic methods in mineralogy, edited by: Beran, A. and Libowitzky, E., Eötvös University Press, Budapest, 189–224, https://doi.org/10.1180/EMU-notes.6.5, 2004. 
Burns, R.: Mineralogical Applications of Crystal Field Theory (Cambridge Topics in Mineral Physics and Chemistry), Cambridge University Press, https://doi.org/10.1017/CBO9780511524899,1993. 
Busigny, V., Cartigny, P., Philippot, P., and Javoy, M.: Ammonium quantification in muscovite by infrared spectroscopy, Chem. Geol., 198, 21–31, https://doi.org/10.1016/S0009-2541(02)00420-5, 2003. 
Busigny, V., Cartigny, P., Philippot, P., and Javoy, M.: Quantitative analysis of ammonium in biotite using infrared spectroscopy, Am. Mineral., 89, 1625–1630, https://doi.org/10.2138/am-2004-11-1206, 2004. 
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Short summary
The structural response of the NH4+ molecule to temperature and pressure changes is studied in ammonium phengite. The symmetry of the molecule is lowered by increasing P or decreasing T; the type and mechanism of this lowered symmetry is different in both cases. Devolatilisation (NH4+ and OH loss) of ammonium phengite is studied as well. This study confirms the wide stability range of phengite and its volatiles and thus has important implications for N and H recycling into the deep Earth.