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Pressure-induced phase transition from calcite to aragonite detected by fluorescence spectroscopy

Chris-Julian Fruhner, Lkhamsuren Bayarjargal, Nadine Schrodt, Rita Luchitskaia, Wolfgang Morgenroth and Bjoern Winkler
Pressure-induced phase transition from calcite to aragonite detected by fluorescence spectroscopy
European Journal of Mineralogy (May 2018) 30 (4): 711-720

Abstract

Pressure-induced structural changes in Eu-doped CaCO (sub 3) have been studied by time-resolved optical fluorescence spectroscopy and by total X-ray scattering combined with a pair distribution function analysis. Time-resolved fluorescence measurements are ideally suited to distinguish between calcitic and aragonitic local environments around the Eu-ions. We show that at ambient temperature calcite transforms at approximately 10 GPa into an amorphous phase which locally has an aragonitic structure. This local structure is maintained on pressure release. The decay times of aragonite and the amorphous phase with a locally aragonitic structure are substantially longer than those of calcite.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 30
Serial Issue: 4
Title: Pressure-induced phase transition from calcite to aragonite detected by fluorescence spectroscopy
Affiliation: Goethe-Universitaet Frankfurt am Main, Institute of Geosciences, Frankfurt am Main, Germany
Pages: 711-720
Published: 20180531
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 60
Accession Number: 2018-064820
Categories: General geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201835
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