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Phase transformations in CaCO3/iron oxide composite induced by thermal treatment and laser irradiation

Abstract :

Calcium carbonate (CaCO3)/iron oxide composites were synthesized through a simple one-step impregnation procedure by mixing iron oxide nanoparticles (γ-Fe2O3 and Fe3O4) of about 6 nm in size and CaCO3 microparticles (Φ = 2 µm–8 µm, vaterite phase). The morphology and structural properties of CaCO3, iron oxide nanoparticles and CaCO3/iron oxide composites were characterized as a function of low iron content (0 %w to 3.2 %w) by scanning electron microscopy and transmission electron microscopy, X-ray diffraction and 57Fe Mössbauer spectrometry. The phase transformations induced by thermal treatment and laser irradiation were investigated in situ by X-ray thermodiffraction (XRTD) and Raman spectroscopy. We have shown that the phase transformations observed by XRTD are also observed under laser irradiation as a consequence of the absorption of the laser irradiation by iron oxide nanoparticles.

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https://hal.univ-angers.fr/hal-03173123
Contributeur : Okina Université d'Angers <>
Soumis le : jeudi 18 mars 2021 - 11:32:52
Dernière modification le : vendredi 28 mai 2021 - 13:58:04

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Thomas Beuvier, Jean-François Bardeau, Brice Calvignac, G. Corbel, François Hindré, et al.. Phase transformations in CaCO3/iron oxide composite induced by thermal treatment and laser irradiation. Journal of Raman Spectroscopy, Wiley, 2013, 44 (3), Non spécifié. ⟨10.1002/jrs.4200⟩. ⟨hal-03173123⟩

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