The spectroscopic characterization of the sulphate mineral ettringite from Kuruman manganese deposits, South Africa.

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dc.contributor.authorFrost, Ray Leslie
dc.contributor.authorLópez, Andrés
dc.contributor.authorXi, Yunfei
dc.contributor.authorCipriano, Ricardo Augusto Scholz
dc.contributor.authorCosta, Geraldo Magela da
dc.contributor.authorLima, Rosa Malena Fernandes
dc.contributor.authorGranja, Amanda
dc.date.accessioned2014-12-14T12:31:08Z
dc.date.available2014-12-14T12:31:08Z
dc.date.issued2013
dc.description.abstractThe 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.pt_BR
dc.identifier.citationFROST, 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.pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.vibspec.2013.08.011
dc.identifier.issn0924-2031
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/4154
dc.language.isoen_USpt_BR
dc.rights.licenseO periódico Vibrational Spectroscopy concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3487241209458.pt_BR
dc.subjectRaman spectroscopypt_BR
dc.subjectEttringitept_BR
dc.subjectKurumanpt_BR
dc.subjectInfrared spectroscopypt_BR
dc.subjectThermal analysispt_BR
dc.titleThe spectroscopic characterization of the sulphate mineral ettringite from Kuruman manganese deposits, South Africa.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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