European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 36, issue 6
Articles | Volume 36, issue 6
https://doi.org/10.5194/ejm-36-1023-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/ejm-36-1023-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 36, issue 6
Research article
 | 
19 Dec 2024
Research article |  | 19 Dec 2024

The coesite–stishovite transition of hydrous, Al-bearing SiO2: an in situ synchrotron X-ray study

Monika Koch-Müller, Christian Lathe, Bernd Wunder, Oona Appelt, Shrikant Bhat, Andreas Ebert, Robert Farla, Vladimir Roddatis, Anja Schreiber, and Richard Wirth

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Short summary
We examined the influence of Al2O3 and H2O on the position of the coesite–stishovite transition by means of in situ X‑ray diffraction measurements with the large-volume press at the synchrotron PETRA III in Hamburg. The position of the transition was found to be shifted almost in parallel by about 1.5 GPa to lower pressures compared to results for the pure SiO2 system by Ono et al. (2017). Stishovite of this study containing Al and H is only partially quenchable but transforms back to coesite.
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Probing the Earth: experiments on and for our planet