Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/3741
Title: Characterization of the sulphate mineral coquimbite, a secondary iron sulphate from Javier Ortega mine, Lucanas Province, Peru – Using infrared, Raman spectroscopy and thermogravimetry.
Authors: Frost, Ray L.
Gobac, Željka Žigovečki
López, Andrés
Xi, Yunfei
Cipriano, Ricardo Augusto Scholz
Lana, Cristiano de Carvalho
Lima, Rosa Malena Fernandes
Keywords: Coquimbite
Amarantite
Raman spectroscopy
Sulphate
Infrared spectroscopy
Issue Date: 2014
Citation: FROST, RAY L. et al. Characterization of the sulphate mineral coquimbite, a secondary iron sulphate from Javier Ortega mine, Lucanas Province, Peru – Using infrared, Raman spectroscopy and thermogravimetry. Journal of Molecular Structure (Print), v. 1, p. 1, 2014. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0022286014001586>. Acesso em: 04 de set. 2014.
Abstract: The mineral coquimbite has been analysed using a range of techniques including SEM with EDX, thermal analytical techniques and Raman and infrared spectroscopy. The mineral originated from the Javier Ortega mine, Lucanas Province, Peru. The chemical formula was determined as (Fe1.37^3+; Al0.63)Σ2.00(SO4)3. 9H2O. Thermal analysis showed a total mass loss of ~73.4% on heating to 1000 °C. A mass loss of 30.43% at 641.4 °C is attributed to the loss of SO3. Observed Raman and infrared bands were assigned to the stretching and bending vibrations of sulphate tetrahedra, aluminium oxide/hydroxide octahedra, water molecules and hydroxyl ions. The Raman spectrum shows well resolved bands at 2994, 3176, 3327, 3422 and 3580 cm^-1 attributed to water stretching vibrations. Vibrational spectroscopy combined with thermal analysis provides insight into the structure of coquimbite.
URI: http://www.repositorio.ufop.br/handle/123456789/3741
metadata.dc.identifier.doi: https://doi.org/10.1016/j.molstruc.2014.01.086
ISSN: 0022-2860
metadata.dc.rights.license: O periódico Journal of Molecular Structure concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3466021201372.
Appears in Collections:DEGEO - Artigos de periódicos

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