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Journal Article

Equation of state and high-pressure phase behaviour of SrCO3

Authors

Biedermann,  Nicole
External Organizations;

Bykova,  Elena
External Organizations;

Morgenroth,  Wolfgang
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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;

Spiekermann,  Georg
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Glazyrin,  Konstantin
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Pakhomova,  Anna
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Appel,  Karen
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Wilke,  Max
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5005253.pdf
(Publisher version), 2MB

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Citation

Biedermann, N., Bykova, E., Morgenroth, W., Efthimiopoulos, I., Müller, J., Spiekermann, G., Glazyrin, K., Pakhomova, A., Appel, K., Wilke, M. (2020): Equation of state and high-pressure phase behaviour of SrCO3. - European Journal of Mineralogy, 32, 575-586.
https://doi.org/10.5194/ejm-32-575-2020


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5005253
Abstract
The high-pressure phase transition of strontianite (SrCO3) was investigated at ambient temperature by means of powder and single-crystal X-ray diffraction. The samples were compressed in a diamond anvil cell to a maximum pressure of 49 GPa. Structure refinements confirm the existence of SrCO3 in the low pressure aragonite-type phase Pmcn (62) up to about 26 GPa. Above this pressure, SrCO3 transforms into a high-pressure phase with post-aragonite crystal structure Pmmn (59). Fitting the volume extracted from the compression data to the third-order Birch–Murnaghan equation of state for the low-pressure phase of SrCO3 yields K0=62.7(6) GPa and K′0=3.2(1), and for the high-pressure phase this yields K0=103(10) GPa and K′0=2.3(6). The unit cell parameters change non-uniformly, with the c axis being 4 times more compressible than the a and b axes. Our results unequivocally show the existence of a Pmmn structure in SrCO3 above 26 GPa and provide important structural parameters for this phase.