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High-temperature infrared properties of forsterite
Authors:Myriam Eckes  Benoit Gibert  Domingos De Sousa Meneses  Mohammed Malki  Patrick Echegut
Institution:1. CNRS, UPR 3079 CEMHTI, 1D Avenue de la Recherche Scientifique, 45071, Orléans Cedex 2, France
2. Laboratoire Geosciences Montpellier, CC060, Université Montpellier 2, Place Eugène Bataillon, 34095, Montpellier Cedex 5, France
3. Polytech’Orléans, Université d’Orléans, Avenue du Parc Floral, BP 6749, 45067, Orléans Cedex 2, France
Abstract:Polarized emittance measurements were acquired for synthetic forsterite, the pure magnesium end member of the olivines group, on the whole infrared spectral range and up to the melting point by using CO2 laser heating. The experimental data, fitted with a semi-quantum dielectric function model, allowed the retrieval of the temperature dependence of the absorption coefficient of forsterite both in the opaque and semi-transparent regions. The analysis of the phonon parameters indicates that the lattice dynamics evolve drastically with increasing temperature. The normal modes involving motions of the magnesium cations located in site 1 are the more impacted, and some of them vanish around 1,200 K. The results confirm that the enhancement of the lattice anharmonicity and the increasing mobility of the magnesium cations are closely linked and are at the origin of the anomalies observed in the evolution of the thermophysical properties. This complete set of spectroscopic data may be a step toward a more precise evaluation of the impact of thermal radiation heat transfer inside systems involving forsterite and quantification of their heat budget.
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