Assessment of the molecular structure of natrodufrénite – NaFe^2+Fe^3+(PO4)4(OH)6.2(H2O), a secondary pegmatite phosphate mineral from Minas Gerais, Brazil.

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dc.contributor.authorLópez, Andrés
dc.contributor.authorFrost, Ray Leslie
dc.contributor.authorXi, Yunfei
dc.contributor.authorCipriano, Ricardo Augusto Scholz
dc.contributor.authorBelotti, Fernanda Maria
dc.contributor.authorRibeiro, Érika
dc.date.accessioned2014-12-14T12:49:14Z
dc.date.available2014-12-14T12:49:14Z
dc.date.issued2013
dc.description.abstractThe mineral natrodufrénite a secondary pegmatite phosphate mineral from Minas Gerais, Brazil, has been studied by a combination of scanning electron microscopy and vibrational spectroscopic techniques. Electron probe analysis shows the formula of the studied mineral as(Na0.88Ca0.12)P1.00(Fe2þ0:72Mn0.11Mg0.08Ca0.04Zr0.01Cu0.01)P0.97 (Fe3þ4:89Al0.02)P4.91(PO4)3.96(OH6.15F0.07)6.22.2.05(H2O). Raman spectroscopy identifies an intense peak at 1003 cm^-1 assigned to the PO4^-3 m1 symmetric stretching mode. Raman bands are observed at 1059 and 1118 cm^-1 and are attributed to the PO4^-3 m3 antisymmetric stretching vibrations. A comparison is made with the spectral data of other hydrate hydroxy phosphateminerals including cyrilovite andwardite. Raman bands at560, 582,619 and 668 cm^-1 are assigned tothe m4PO3 4 bendingmodes and Ramanbands at425,444, 477 and 507 cm^-1 are due to the m2PO3 4 bendingmodes. Raman bands inthe 2600–3800 cm^-1 spectral range are attributed towater and OH stretching vibrations. Vibrational spectroscopy enables aspects of themolecular structure of natrodufrénite to be assessed..pt_BR
dc.identifier.citationLÓPEZ, A. et al. Assessment of the molecular structure of natrodufrénite – NaFe^2+Fe^3+(PO4)4(OH)6.2(H2O), a secondary pegmatite phosphate mineral from Minas Gerais, Brazil. Journal of Molecular Structure, v. 1051, p. 265-270, 2013. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0022286013006947>. Acesso em: 07 out. 2014.pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.molstruc.2013.08.018
dc.identifier.issn0022-2860
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/4165
dc.language.isoen_USpt_BR
dc.rights.licenseO periódico Journal of Molecular Structure concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3487241294767.pt_BR
dc.subjectNatrodufrénitept_BR
dc.subjectPhosphatept_BR
dc.subjectPegmatitept_BR
dc.subjectInfrared spectroscopypt_BR
dc.subjectRaman spectroscopypt_BR
dc.titleAssessment of the molecular structure of natrodufrénite – NaFe^2+Fe^3+(PO4)4(OH)6.2(H2O), a secondary pegmatite phosphate mineral from Minas Gerais, Brazil.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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