Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/jspui/handle/123456789/5228
Title: Vibrational spectroscopic study of poldervaartite CaCa[SiO3(OH)(OH)].
Authors: Frost, Ray Leslie
López, Andrés
Cipriano, Ricardo Augusto Scholz
Lima, Rosa Malena Fernandes
Keywords: Poldervaartite
Silicate
Thermogravimetric analyses
Scanning electron microscopy
Infrared and Raman spectroscopy
Issue Date: 2015
Citation: FROST, R. L. et al. Vibrational spectroscopic study of poldervaartite CaCa[SiO3(OH)(OH)]. Molecular and Biomolecular Spectroscopy, v. 137, p. 827-831, 2015. Disponível em: <http://www.sciencedirect.com/science/article/pii/S138614251401347X>. Acesso em: 06 mar. 2015.
Abstract: We have studied the mineral poldervaartite CaCa[SiO3(OH)(OH)] which forms a series with its manganese analogue olmiite CaMn[SiO3(OH)](OH) using a range of techniques including scanning electron microscopy, thermogravimetric analysis, Raman and infrared spectroscopy. Chemical analysis shows the mineral is reasonably pure and contains only calcium and manganese with low amounts of Al and F. Thermogravimetric analysis proves the mineral decomposes at 485 _C with a mass loss of 7.6% compared with the theoretical mass loss of 7.7%. A strong Raman band at 852 cm_1 is assigned to the SiO stretching vibration of the SiO3(OH) units. Two Raman bands at 914 and 953 cm_1 are attributed to the antisymmetric vibrations. Intense prominent peaks observed at 3487, 3502, 3509, 3521 and 3547 cm_1 are assigned to the OH stretching vibration of the SiO3(OH) units. The observation of multiple OH bands supports the concept of the non-equivalence of the OH units. Vibrational spectroscopy enables a detailed assessment of the molecular structure of poldervaartite
URI: http://www.repositorio.ufop.br/handle/123456789/5228
metadata.dc.identifier.doi: https://doi.org/10.1016/j.saa.2014.09.017
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: 3585901100464.
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