Characterization of the sulphate mineral amarantite - using infrared, Raman spectroscopy and thermogravimetry.

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dc.contributor.authorFrost, Ray Leslie
dc.contributor.authorLópez, Andrés
dc.contributor.authorCipriano, Ricardo Augusto Scholz
dc.contributor.authorXi, Yunfei
dc.contributor.authorSilveira, Aléssio Jordan da
dc.contributor.authorLima, Rosa Malena Fernandes
dc.date.accessioned2014-12-17T13:32:27Z
dc.date.available2014-12-17T13:32:27Z
dc.date.issued2013
dc.description.abstractThe mineral amarantite Fe3þ 2 (SO4)O _ 7H2O has been studied using a combination of techniques including thermogravimetry, electron probe analyses and vibrational spectroscopy. Thermal analysis shows decomposition steps at 77.63, 192.2, 550 and 641.4 _C. The Raman spectrum of amarantite is dominated by an intense band at 1017 cm_1 assigned to the SO2_ 4 m1 symmetric stretching mode. Raman bands at 1039, 1054, 1098, 1131, 1195 and 1233 cm_1 are attributed to the SO2_ 4 m3 antisymmetric stretching modes. Very intense Raman band is observed at 409 cm_1 with shoulder bands at 399, 451 and 491 cm_1 are assigned to the m2 bending modes. A series of low intensity Raman bands are found at 543, 602, 622 and 650 cm_1 are assigned to the m4 bending modes. A very sharp Raman band at 3529 cm_1 is assigned to the stretching vibration of OH units. A series of Raman bands observed at 3025, 3089, 3227, 3340, 3401 and 3480 cm_1 are assigned to water bands. Vibrational spectroscopy enables aspects of the molecular structure of the mineral amarantite to be ascertained.pt_BR
dc.identifier.citationFROST, R. L. et al. Characterization of the sulphate mineral amarantite - using infrared, Raman spectroscopy and thermogravimetry. Disponível em: <http://www.sciencedirect.com/science/article/pii/S1386142513004605>. Acesso em: 07 out. 2014.pt_BR
dc.identifier.citationhttps://doi.org/10.1016/j.saa.2013.04.111
dc.identifier.issn1386-1425
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/4196
dc.language.isoen_USpt_BR
dc.rights.licenseO periódico Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença  3487300298651.pt_BR
dc.subjectRaman spectroscopypt_BR
dc.subjectAmarantitept_BR
dc.subjectInfrared spectroscopypt_BR
dc.subjectSulphatept_BR
dc.subjectEvaporitept_BR
dc.titleCharacterization of the sulphate mineral amarantite - using infrared, Raman spectroscopy and thermogravimetry.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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