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|Title:||A vibrational spectroscopic study of the silicate mineral lomonosovite Na5Ti2(Si2O7)(PO4)O2.|
|Authors:||Frost, Ray Leslie|
Theiss, Frederick L.
Graça, Leonardo Martins
Cipriano, Ricardo Augusto Scholz
|Citation:||FROST, R. L. et al. A vibrational spectroscopic study of the silicate mineral lomonosovite Na5Ti2(Si2O7)(PO4)O2. Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy (Print), v. x, p. xx-xxx, 2014. Disponível em: <http://www.sciencedirect.com/science/article/pii/S1386142514008932>. Acesso em: 30 set. 2014.|
|Abstract:||The mineral lomonosovite has been studied using a combination of scanning electron microscopy with energy dispersive X-ray analysis and vibrational spectroscopy. Qualitative chemical analysis gave Si, P, Na and Ti as the as major elements with small amounts of Mn, Ca, Fe and Al. The mineral lomonosovite has a formula Na5Ti2(Si2O7)(PO4)O2. Raman bands observed at 909, 925 and 939 cm^-1 are associated with phosphate units. Raman bands found at 975, 999, 1070, 1080 and 1084 cm^-1 are attributed to siloxane stretching vibrations. The observation of multiple bands in both the phosphate stretching and bending regions supports the concept that the symmetry of the phosphate anion in the structure of lomonosovite is significantly reduced. Infrared spectroscopy identifies bands in the water stretching and bending regions, thus suggesting that water is involved with the structure of lomonosovite either through adsorption on the surface or by bonding to the phosphate units.|
|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: 3481460522088.|
|Appears in Collections:||DEGEO - Artigos de periódicos|
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