Vibrational response of strontianite at high pressures and high temperatures 
and construction of P–T phase diagram

Efthimiopoulos, I.; Müller, Jan; Winkler, B.; Otzen, C.; Harms, Martin; Schade, U.; Koch-Müller, M.

doi:10.1007/s00269-018-0984-8

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Vibrational response of strontianite at high pressures and high temperatures and construction of P–T phase diagram

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/persons/resource/iliefthi

Efthimiopoulos, I.
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/jmueller

Müller, Jan
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Winkler, B.
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Otzen, C.
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/persons/resource/harms

Harms, Martin
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Schade, U.
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/persons/resource/mkoch

Koch-Müller, M.
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Zitation

Efthimiopoulos, I., Müller, J., Winkler, B., Otzen, C., Harms, M., Schade, U., Koch-Müller, M. (2019): Vibrational response of strontianite at high pressures and high temperatures and construction of P–T phase diagram. - Physics and Chemistry of Minerals, 46, 1, 27-35.
https://doi.org/10.1007/s00269-018-0984-8

Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_3504889

Zusammenfassung

Our joint high-pressure and high-temperature mid-infrared absorbance and Raman investigations on a synthetic strontianite sample led to the construction of the respective pressure–temperature P–T phase diagram (maximum P = 38 GPa, maximum T = 800 K). Our results allowed for the determination of the P–T slope for the onset pressure of the aragonite Pmcn → post-aragonite Pmmn structural transition reported in the literature, which is found to be negative and equal to ΔP/ΔT = − 0.012 GPa/K. The determined SrCO3 P–T phase diagram appears consistent with the respective P–T phase diagrams of relevant aragonite-type carbonates. In addition, we provide the first ever measured far-infrared absorbance spectra under pressure for the family of aragonite-type carbonates. Our complementary first-principle calculations were able to reproduce the infrared spectra of both Pmcn and Pmmn phases of strontianite.