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

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.creatorFrost, Ray L.-
Autor(es): dc.creatorLópez, Andrés-
Autor(es): dc.creatorXi, Yunfei-
Autor(es): dc.creatorScholz, Ricardo Augusto-
Autor(es): dc.creatorCosta, Geraldo Magela da-
Autor(es): dc.creatorLima, Rosa Malena Fernandes-
Autor(es): dc.creatorGranja, Amanda-
Data de aceite: dc.date.accessioned2019-11-06T13:31:38Z-
Data de disponibilização: dc.date.available2019-11-06T13:31:38Z-
Data de envio: dc.date.issued2014-12-14-
Data de envio: dc.date.issued2014-12-14-
Data de envio: dc.date.issued2013-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/4154-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/557259-
Descrição: dc.descriptionThe 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.-
Idioma: dc.languageen-
Direitos: dc.rightsO Periódico Vibrational Spectroscopy concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3487241209458.-
Palavras-chave: dc.subjectRaman spectroscopy-
Palavras-chave: dc.subjectEttringite-
Palavras-chave: dc.subjectKuruman-
Palavras-chave: dc.subjectInfrared spectroscopy-
Palavras-chave: dc.subjectThermal analysis-
Título: dc.titleThe spectroscopic characterization of the sulphate mineral ettringite from Kuruman manganese deposits, South Africa.-
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