Pressure-induced structural changes in Eu-doped CaCO3 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 ∼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.
Pressure-induced phase transition from calcite to aragonite detected by fluorescence spectroscopy
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Chris-Julian Fruhner, Lkhamsuren Bayarjargal, Nadine Schrodt, Rita Luchitskaia, Wolfgang Morgenroth, Björn Winkler; Pressure-induced phase transition from calcite to aragonite detected by fluorescence spectroscopy. European Journal of Mineralogy ; 30 (4): 711–720. doi: https://doi.org/10.1127/ejm/2018/0030-2759
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