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Title: Raman and infrared spectroscopic characterization of the phosphate mineral paravauxite Fe2+Al2(PO4)2(OH)2. 8H2O.
Authors: Frost, Ray Leslie
Cipriano, Ricardo Augusto Scholz
López, Andrés
Xi, Yunfei
Gobac, Željka Žigovečki
Keywords: Paravauxite
Raman spectroscopy
Infrared spectroscopy
Issue Date: 2013
Citation: FROST, R. L. et al. Raman and infrared spectroscopic characterization of the phosphate mineral paravauxite Fe2+Al2(PO4)2(OH)2. 8H2O. Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy, v. 116, p. 491-496, 2013. Disponível em: <>. Acesso em: 07 out. 2014.
Abstract: We have undertaken a vibrational spectroscopic study of paravauxite the Siglo XX mine, Bustillo Province, northern of Potosí department, Bolivia. This mine is important source for rare and unusual secondary phosphate minerals and is the type locality for a number of rare phosphates such as vauxite, sigloite, metavauxite and for jeanbandyite. The chemical formula of the studied sample was determined as Fe^2+0,95; (Al0:07)R1:02ðAlÞ2:09ðPO4Þ1:97ðOHÞ1:98.7:90(H2O).The Raman spectrum is dominated by an intense Raman band at 1020 cm^-1assigned to the PO4^-3 m1symmetric stretching mode. Low intensity Raman bands found at 1058, 1115 and 1148 cm^-1 are assigned to the PO4^-3 m3 antisymmetric stretching vibrations. Raman bands of paravauxite at 537, 570, 609 and 643 cm^-1 are assigned to the m4 PO4^-3 bending modes whilst the Raman bands at 393 and 420 cm^-1are due to the m2 PO4^-3 bending modes. The Raman spectral profile of paravauxite in the hydroxyl stretching region is broad with component bands resolved at 3086, 3215, 3315, 3421, 3505 and 3648 cm^-1. Vibrational spectroscopy enables the assessment of the molecular structure of paravauxite to be undertaken.
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: 3487250047463.
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