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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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.