Alves, J.F.; Edwards, H.G.M.; Korsakov, A.; de Oliveira, L.F.C. Revisiting the Raman Spectra of Carbonate Minerals. Minerals2023, 13, 1358.
Alves, J.F.; Edwards, H.G.M.; Korsakov, A.; de Oliveira, L.F.C. Revisiting the Raman Spectra of Carbonate Minerals. Minerals 2023, 13, 1358.
Alves, J.F.; Edwards, H.G.M.; Korsakov, A.; de Oliveira, L.F.C. Revisiting the Raman Spectra of Carbonate Minerals. Minerals2023, 13, 1358.
Alves, J.F.; Edwards, H.G.M.; Korsakov, A.; de Oliveira, L.F.C. Revisiting the Raman Spectra of Carbonate Minerals. Minerals 2023, 13, 1358.
Abstract
This work presents a new discussion about the vibrational properties of the carbonate ion displayed in several different environments, not only the microparameters introduced by cation substitution and different crystal lattices but also the crystal aggregation, showing how their active Raman modes are affected by these changes by using data obtained with four different laser excitation sources. New Raman spectra excited at 1064 nm are reported for calcite, aragonite, and dolomite groups, also including magnesite, witherite, rhodochrosite, siderite, malachite and azurite. These new data contribute to the discussion and understanding of these materials and their spectra, bringing new observations based on the Raman modes, focusing on the internal symmetrical and asymmetrical stretching and bending modes of the carbonate ion, highlighting the differences observed in the relative intensity and width of the bands. The results indicate some evidence of the influence of the crystal habit and/or the growth of the mineral itself in the Raman spectrum. In addition, the data show the influence of the cation substitution upon the Raman band width and that small cations contribute to less rigid crystalline structures and, consequently, larger Raman bandwidths.
Environmental and Earth Sciences, Geochemistry and Petrology
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