Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/4338
Title: Vibrational spectroscopic characterization of the phosphate mineral ludlamite (Fe,Mn,Mg)3(PO4)2 4H2O - a mineral found in lithium bearing pegmatites.
Authors: Frost, Ray Leslie
Xi, Yunfei
Cipriano, Ricardo Augusto Scholz
Belotti, Fernanda Maria
Keywords: Raman
Infrared
Molecular structure
Ludlamite
Pegmatite
Issue Date: 2013
Citation: FROST, R. L. et al. Vibrational spectroscopic characterization of the phosphate mineral ludlamite (Fe,Mn,Mg)3(PO4)2 4H2O - a mineral found in lithium bearing pegmatites. Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy, v. 103, p. 143-150, 2013. Disponível em: <http://www.sciencedirect.com/science/article/pii/S1386142512011158>. Acesso em: 07 out. 2014.
Abstract: The objective of this work is to analyze ludlamite (Fe,Mn,Mg)3(PO4)2_4H2O from Boa Vista mine, Galiléia, Brazil and to assess the molecular structure of the mineral. The phosphate mineral ludlamite has been characterized by EMP-WDS, Raman and infrared spectroscopic measurements. The mineral is shown to be a ferrous phosphate with some minor substitution of Mg and Mn. Raman bands at 917 and 950 cm_1 are assigned to the symmetric stretching mode of HOPO2_ 3 and PO3_ 4 units. Raman bands at 548, 564, 599 and 634 cm_1 are assigned to the m4 PO3_ 4 bending modes. Raman bands at 2605, 2730, 2896 and 3190 cm_1 and infrared bands at 2623, 2838, 3136 and 3185 cm_1 are attributed to water stretching vibrations. By using a Libowitzky empirical function, hydrogen bond distances are calculated from the OH stretching wavenumbers. Strong hydrogen bonds in the structure of ludlamite are observed as determined by their hydrogen bond distances. The application of infrared and Raman spectroscopy to the study of ludlamite enables the molecular structure of the pegmatite mineral ludlamite to be assessed.
URI: http://www.repositorio.ufop.br/handle/123456789/4338
metadata.dc.identifier.doi: https://doi.org/10.1016/j.saa.2012.11.023
ISSN: 1386-1425
metadata.dc.rights.license: O periódico Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3487791465695.
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