Raman spectra of phase a at various pressures and temperatures |
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| Institution: | 1. Aix Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, Marseille 13388, France;2. Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303, CNRS-Université de Bourgogne Franche Comté, Dijon, France;3. Laboratoire GEOPS (Géosciences Paris Sud), Bat. 509, Université Paris Sud, Orsay Cedex 91405, France;4. Muséum d’Histoire Naturelle, Paris, France;5. Aix-Marseille Université, CNRS, IRD, CEREGE UM34, Aix-en-Provence 13545, France;6. Université de Franche-Comté, Institut UTINAM, CNRS/INSU, UMR 6213, Besançon Cedex, France;7. Leeds University, School of Earth and Environment, Leeds, United Kingdom;1. Department of Earth Sciences, Institute of Geochemistry and Petrology, ETH, 8092 Zurich, Switzerland;2. Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Botticelli 23, 20133 Milano, Italy |
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| Abstract: | Variations of the Raman spectra of phase A (Mg7Si2O14H6) were investigated up to about 400 kbar at room temperature and in the range 80–853 K at atmospheric pressure. Phase A appears to undergo a reversible phase transition around 180 kbar at room temperature, and it becomes amorphous above 813 K at atmospheric pressure. The Raman frequencies of the two strong OH bands of phase A decrease linearly with increasing pressure, but increase non-linearly with increasing temperature. The frequencies of the other Raman bands of phase A increase non-linearly with increasing pressure but decrease both linearly and non-linearly with increasing temperature within the experimental uncertainties and the range investigated. The trends of the pressure and temperature effects on the Raman frequencies of phase A parallel those observed in the hydrous β-phase, but nonlinear behaviour was not observed in the latter. |
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