Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Efthimiopoulos, Ilias UNSPECIFIED orcid.org/0000-0001-6542-8188 UNSPECIFIED Germer, Marisa UNSPECIFIED UNSPECIFIED UNSPECIFIED Jahn, Sandro UNSPECIFIED orcid.org/0000-0002-2137-8833 UNSPECIFIED Harms, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Reichmann, Hans Josef UNSPECIFIED UNSPECIFIED UNSPECIFIED Speziale, Sergio UNSPECIFIED UNSPECIFIED UNSPECIFIED Schade, Ulrich UNSPECIFIED orcid.org/0000-0002-4194-2235 UNSPECIFIED Sieber, Melanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Koch-Mueller, Monika UNSPECIFIED UNSPECIFIED UNSPECIFIED
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:	Keywords Language HIGH-TEMPERATURE; VIBRATIONAL-SPECTRA; EFFECTIVE CHARGES; CRYSTAL-STRUCTURE; PHASE-DIAGRAM; AB-INITIO; X-RAY; SPECTROSCOPY; ARAGONITE; BEHAVIOR Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15959