Universität zu Köln

Efthimiopoulos, I., Jahn, S., Kuras, A., Schade, U. and Koch-Mueller, M. (2017). Combined high-pressure and high-temperature vibrational studies of dolomite: phase diagram and evidence of a new distorted modification. Phys. Chem. Miner., 44 (7). S. 465 - 477. NEW YORK: SPRINGER. ISSN 1432-2021

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Abstract

A combined high-pressure mid-infrared absorption and Raman spectroscopy study on a natural -CaMg0.98Fe0.02(CO3)(2) dolomite sample was performed both at ambient and high temperatures. A pressure-temperature phase diagram was constructed for all the reported dolomite ambient-and high-pressure polymorphs. In addition, a local distortion of the ambient-pressure dolomite structure was identified close to 11 GPa, just before the transition toward the first known high-pressure phase. All the Clausius-Clapeyron slopes are found to be positive with similar magnitudes. Complementary first-principles calculations suggest a metastable nature of the high-pressure dolomite polymorphs. Finally, theoretical spectroscopy is used to interpret and discuss the observed changes in the measured vibrational spectra.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Efthimiopoulos, I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jahn, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kuras, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schade, U. UNSPECIFIED UNSPECIFIED UNSPECIFIED Koch-Mueller, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-226856
DOI:	10.1007/s00269-017-0874-5
Journal or Publication Title:	Phys. Chem. Miner.
Volume:	44
Number:	7
Page Range:	S. 465 - 477
Date:	2017
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1432-2021
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ARAGONITE PLUS MAGNESITE; X-RAY-DIFFRACTION; CARBONATE STABILITY; CRYSTAL-STRUCTURE; CALCITE-III; BEHAVIOR; TRANSFORMATIONS; SPECTROSCOPY; CAMG(CO3)(2); TRANSITION Multiple languages Materials Science, Multidisciplinary; Mineralogy Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/22685