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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Cited articles

Angel, R. J., Chopelas, A., and Ross, N. L.: Stability of high-density clinoenstatite at upper-mantle pressures, Nature, 358, 322–324, https://doi.org/10.1038/358322a0, 1992. 
Akaogi, M., Oohata, M., Kojitani, H., and Kawaji, H.: Thermodynamic properties of stishovite by low-temperature heat capacity measurements and the coesite-stishovite transition boundary, Am. Mineral., 96, 1325–1330, https://doi.org/10.2138/am.2011.3748, 2011. 
Akimoto, S.: The system MgO-FeO-SiO2 at high pressures and temperatures – phase equilibria and elastic properties, Tectonophysics, 13, 161–187, https://doi.org/10.1016/B978-0-444-41015-3.50016-1, 1972. 
Bolfan-Casanova, N., Andrault, D., Amiguet, E., and Guignot, N.: Equation of state and post-stishovite transformation of Al-bearing silica up to 100 GPa and 3000 K, Phys. Earth Planet. Inter., 174, 70–77, https://doi.org/10.1016/j.pepi.2008.06.024, 2009. 
Bromiley, G. D. and Pawley, A. R.: The stability of antigorite in the systems MgO-SiO2-H2O (MSH) and MgO-Al2O3-SiO2-H2O (MASH): The effects of Al3+ substitution on high-pressure stability, Am. Mineral., 88, 99–108, https://doi.org/10.2138/am-2003-0113, 2003. 
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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