Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/4515
Title: Vibrational spectroscopic characterization of the phosphate mineral althausite Mg2(PO4)(OH,F,O) - implications for the molecular structure.
Authors: Frost, Ray Leslie
López, Andrés
Xi, Yunfei
Cipriano, Ricardo Augusto Scholz
Keywords: Althausite
Phosphate
Raman
Infrared
Pegmatite
Issue Date: 2014
Citation: FROST, R. L. et al. Vibrational spectroscopic characterization of the phosphate mineral althausite Mg2(PO4)(OH,F,O) - implications for the molecular structure. Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy, v. 120, p. 252-256, 2014. Disponível em: <http://www.sciencedirect.com/science/article/pii/S138614251301175X>. Acesso em: 07 out. 2014.
Abstract: Natural single-crystal specimens of althausite from Brazil, with general formula Mg2(PO4)(OH,F,O) were investigated by Raman and infrared spectroscopy. The mineral occurs as a secondary product in granitic pegmatites. The Raman spectrum of althausite is characterized by bands at 1020, 1033 and 1044 cm_1, assigned to m1 symmetric stretching modes of the HOPO3_ 3 and PO3_ 4 units. Raman bands at around 1067, 1083 and 1138 cm_1 are attributed to both the HOP and PO antisymmetric stretching vibrations. The set of Raman bands observed at 575, 589 and 606 cm_1 are assigned to the m4 out of plane bending modes of the PO4 and H2PO4 units. Raman bands at 439, 461, 475 and 503 cm_1 are attributed to the m2 PO4 and H2PO4 bending modes. Strong Raman bands observed at 312, 346 cm_1 with shoulder bands at 361, 381 and 398 cm_1 are assigned to MgO stretching vibrations. No bands which are attributable to water were found. Vibrational spectroscopy enables aspects of the molecular structure of althausite to be assessed.
URI: http://www.repositorio.ufop.br/handle/123456789/4515
metadata.dc.identifier.doi: https://doi.org/10.1016/j.saa.2013.10.018
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 3487790248684.
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