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Vibrational spectroscopic study of poldervaartite CaCa[SiO3(OH)(OH)].

Authors :
Frost RL
López A
Scholz R
Lima RM
Source :
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy [Spectrochim Acta A Mol Biomol Spectrosc] 2015 Feb 25; Vol. 137, pp. 827-31. Date of Electronic Publication: 2014 Sep 22.
Publication Year :
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.<br /> (Copyright © 2014 Elsevier B.V. All rights reserved.)

Details

Language :
English
ISSN :
1873-3557
Volume :
137
Database :
MEDLINE
Journal :
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy
Publication Type :
Academic Journal
Accession number :
25280331
Full Text :
https://doi.org/10.1016/j.saa.2014.09.017