Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/3883
Title: A Raman and infrared spectroscopic characterisation of the phosphate mineral phosphohedyphane Ca2Pb3(PO4)3Cl from the Roote mine, Nevada, USA.
Authors: Frost, Ray Leslie
Cipriano, Ricardo Augusto Scholz
López, Andrés
Souza, Bárbara Emilly Vieira Firmino e
Lana, Cristiano de Carvalho
Xi, Yunfei
Keywords: Phosphohedyphane
Hedyphane
Phosphate
Arsenate
Hydroxyl
Issue Date: 2014
Citation: FROST, RAY L. et al. A Raman and infrared spectroscopic characterisation of the phosphate mineral phosphohedyphane Ca2Pb3(PO4)3Cl from the Roote mine, Nevada, USA. Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy, v. 128, p. 237-242, 2014. Disponível em: <http://www.sciencedirect.com/science/article/pii/S1386142514002546>. Acesso em: 04 set. 2014.
Abstract: Phosphohedyphane Ca2Pb3(PO4)3Cl is rare Ca and Pb phosphate mineral that belongs to the apatite supergroup. We have analysed phosphohedyphane using SEM with EDX, and Raman and infrared spectroscopy. The chemical analysis shows the presence of Pb, Ca, P and Cl and the chemical formula is expressed as Ca2Pb3(PO4)3Cl. The very sharp Raman band at 975 cm^-1 is assigned to the PO4^3- v1 symmetric stretching mode. Raman bands noted at 1073, 1188 and 1226 cm^-1 are to the attributed to the PO4^3- v3 antisymmetric stretching modes. The two Raman bands at 835 and 812 cm^-1 assigned to the AsO4^3- v1 symmetric stretching vibration and AsO4^3- v3 antisymmetric stretching modes prove the substitution of As for P in the structure of phosphohedyphane. A series of bands at 557, 577 and 595 cm^-1 are attributed to the v4 out of plane bending modes of the PO4 units. The multiplicity of bands in the v2, v3 and v4 spectral regions provides evidence for the loss of symmetry of the phosphate anion in the phosphohedyphane structure. Observed bands were assigned to the stretching and bending vibrations of phosphate tetrahedra. Some Raman bands attributable to OH stretching bands were observed, indicating the presence of water and/or OH units in the structure.
URI: http://www.repositorio.ufop.br/handle/123456789/3883
metadata.dc.identifier.doi: https://doi.org/10.1016/j.saa.2014.02.067
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: 3466020740281.
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