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Título : | The spectroscopic characterization of the sulphate mineral ettringite from Kuruman manganese deposits, South Africa. |
Autor : | Frost, Ray Leslie López, Andrés Xi, Yunfei Cipriano, Ricardo Augusto Scholz Costa, Geraldo Magela da Lima, Rosa Malena Fernandes Granja, Amanda |
Palabras clave : | Raman spectroscopy Ettringite Kuruman Infrared spectroscopy Thermal analysis |
Fecha de publicación : | 2013 |
Citación : | FROST, R. L. et al. The spectroscopic characterization of the sulphate mineral ettringite from Kuruman manganese deposits, South Africa. Vibrational Spectroscopy, v. 68, p. 266-271, 2013. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0924203113001070>. Acesso em: 07 out. 2014. |
Resumen : | The mineral ettringite has been studied using a number of techniques, including XRD, SEM with EDX, thermogravimetry and vibrational spectroscopy. The mineral proved to be composed of 53% of ettringite and 47% of thaumasite in a solid solution. Thermogravimetry shows a mass loss of 46.2% up to 1000 ◦C. Raman spectroscopy identifies multiple sulphate symmetric stretching modes in line with the three sulphate crystallographically different sites. Raman spectroscopy also identifies a band at 1072 cm−1 attributed to a carbonate symmetric stretching mode, confirming the presence of thaumasite. The observation of multiple bands in the _4 spectral region between 700 and 550 cm−1 offers evidence for the reduction in symmetry of the sulphate anion from Td to C2v or even lower symmetry. The Raman band at 3629 cm−1 is assigned to the OH unit stretching vibration and the broad feature at around 3487 cm−1 to water stretching bands. Vibrational spectroscopy enables an assessment of the molecular structure of natural ettringite to be made. |
URI : | http://www.repositorio.ufop.br/handle/123456789/4154 |
metadata.dc.identifier.doi: | https://doi.org/10.1016/j.vibspec.2013.08.011 |
ISSN : | 0924-2031 |
metadata.dc.rights.license: | O periódico Vibrational Spectroscopy concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3487241209458. |
Aparece en las colecciones: | DEGEO - Artigos publicados em periódicos |
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Fichero | Descripción | Tamaño | Formato | |
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ARTIGO_SpectroscopicCharacterizationEttringite.pdf Restricted Access | 1,18 MB | Adobe PDF | Visualizar/Abrir |
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