Vibrational spectroscopy of the silicate mineral plumbotsumite Pb5(OH)10Si4O8 – An assessment of the molecular structure

Lopez, Andres and Frost, Ray L. and Scholz, Ricardo and Žigovečki Gobac, Željka and Xi, Yunfei (2013) Vibrational spectroscopy of the silicate mineral plumbotsumite Pb5(OH)10Si4O8 – An assessment of the molecular structure. Journal of Molecular Structure, 1054. pp. 228-233.

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Abstract

We have used scanning electron microscopy with energy dispersive X-ray analysis to determine the precise formula of plumbotsumite, a rare lead silicate mineral of formula Pb5(OH)10Si4O8. This study forms the first systematic study of plumbotsumite from the Bigadic deposits, Turkey. Vibrational spectroscopy was used to assess the molecular structure of plumbotsumite as the structure is not known. The mineral is characterized by sharp Raman bands at 1047, 1055 and 1060 cm-1 assigned to SiO stretching vibrational modes and sharp Raman bands at 673, 683 and 697 cm-1 assigned to OSiO bending modes. The observation of multiple bands offers support for a layered structure with variable SiO3 structural units. Little information may be obtained from the infrared spectra because of broad spectral profiles. Intense Raman bands at 3510, 3546 and 3620 cm-1 are ascribed to OH stretching modes. Evidence for the presence of water in the plumbotsumite structure was inferred from the infrared spectra.

Item Type: Article
Keywords: Plumbotsumite, Molecular structure, Raman spectroscopy, Silicate, Infrared
Date: 2013
Subjects: NATURAL SCIENCES > Geology > Mineralogy and Petrology
Divisions: Faculty of Science > Department of Geology
Depositing User: Danica Vujičić
Date Deposited: 02 Jul 2015 10:30
Last Modified: 02 Jul 2015 10:30
URI: http://digre.pmf.unizg.hr/id/eprint/3683

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