Traces of structural H2O molecules in baryte |
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Authors: | Anton Beran Dominik Talla Zdenek Losos Jiri Pinkas |
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Institution: | 1. Institut für Mineralogie und Kristallographie, Universit?t Wien-Geozentrum, Althanstrasse 14, 1090, Wien, Austria 2. Department of Geological Sciences, Masaryk University, Kotlarska 2, 61137, Brno, Czech Republic 3. Department of Chemistry, Masaryk University, Kotlarska 2, 61137, Brno, Czech Republic
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Abstract: | The infrared (IR) spectra of gem-quality baryte crystals from different occurrences are characterized by relatively weak but
strongly pleochroic absorption bands at 3,280, 3,220, 3,155, and 3,115 cm−1. These bands are assigned to anti-symmetric and symmetric OH stretching vibrations of two types of H2O molecules localized on vacant Ba sites. The H–H axis of the H2O I molecule is slightly tilted from the a-axis direction, its twofold axis being nearly parallel to the b-axis, thus defining the plane of the H2O molecule practically parallel to (001). The H2O II molecule has its H–H axis parallel to the b-axis direction, with its plane lying approximately parallel to (101). The values of the total water contents of the baryte
crystals, calculated on the basis of IR spectroscopic data, are ranging from about 1.7–3.8 wt.ppm. The possible presence of
H3O+ ions is also discussed. |
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