Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/4154
Title: The spectroscopic characterization of the sulphate mineral ettringite from Kuruman manganese deposits, South Africa.
Authors: Frost, Ray Leslie
López, Andrés
Xi, Yunfei
Cipriano, Ricardo Augusto Scholz
Costa, Geraldo Magela da
Lima, Rosa Malena Fernandes
Granja, Amanda
Keywords: Raman spectroscopy
Ettringite
Kuruman
Infrared spectroscopy
Thermal analysis
Issue Date: 2013
Citation: 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.
Abstract: 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.
Appears in Collections:DEGEO - Artigos de periódicos

Files in This Item:
File Description SizeFormat 
ARTIGO_SpectroscopicCharacterizationEttringite.pdf1,18 MBAdobe PDFView/Open    Request a copy


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.