Efthimiopoulos, Ilias ORCID: 0000-0001-6542-8188, Germer, Marisa, Jahn, Sandro ORCID: 0000-0002-2137-8833, Harms, Martin, Reichmann, Hans Josef, Speziale, Sergio, Schade, Ulrich ORCID: 0000-0002-4194-2235, Sieber, Melanie and Koch-Mueller, Monika (2019). Effects of hydrostaticity on the structural stability of carbonates at lower mantle pressures: the case study of dolomite. High Pressure Res., 39 (1). S. 36 - 50. ABINGDON: TAYLOR & FRANCIS LTD. ISSN 1477-2299

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Abstract

We have conducted high pressure far-infrared absorbance and Raman spectroscopic investigations on a natural iron-free dolomite sample up to 40 GPa. Comparison between the present observations and literature results unraveled the effect of hydrostatic conditions on the high pressure dolomite polymorph adopted close to 40 GPa, i.e. the triclinic Dol-IIIc modification. In particular, non-hydrostatic conditions impose structural disorder at these pressures, whereas hydrostatic conditions allow the detection of an ordered Dol-IIIc vibrational response. Hence, hydrostatic conditions appear to be a key ingredient for modeling carbon subduction at lower mantle conditions. Our complementary first-principles calculations verified the far-infrared vibrational response of the ambient- and high pressure dolomite phases.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Efthimiopoulos, IliasUNSPECIFIEDorcid.org/0000-0001-6542-8188UNSPECIFIED
Germer, MarisaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jahn, SandroUNSPECIFIEDorcid.org/0000-0002-2137-8833UNSPECIFIED
Harms, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Reichmann, Hans JosefUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Speziale, SergioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schade, UlrichUNSPECIFIEDorcid.org/0000-0002-4194-2235UNSPECIFIED
Sieber, MelanieUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Koch-Mueller, MonikaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-159596
DOI: 10.1080/08957959.2018.1558223
Journal or Publication Title: High Pressure Res.
Volume: 39
Number: 1
Page Range: S. 36 - 50
Date: 2019
Publisher: TAYLOR & FRANCIS LTD
Place of Publication: ABINGDON
ISSN: 1477-2299
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
HIGH-TEMPERATURE; VIBRATIONAL-SPECTRA; EFFECTIVE CHARGES; CRYSTAL-STRUCTURE; PHASE-DIAGRAM; AB-INITIO; X-RAY; SPECTROSCOPY; ARAGONITE; BEHAVIORMultiple languages
Physics, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/15959

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