Vibrational Spectra and Structure of Potassium Alum Kal(SO4)2·12[(H2O) x (D2O)1−x ] |
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| Authors: | M. V. Barashkov A. I. Komyak S. N. Shashkov |
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| Affiliation: | (1) Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skorina Ave., Minsk, 220072;(2) Belarusian State University, Minsk, Belarus |
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| Abstract: | The IR spectra and polarization Raman spectra of Kal(SO4)2·12(H2O) and Kal(SO4)2·12[H2O)0.3(D2O)0.7] crystals at 93 K and room temperature have been obtained experimentally. The vibrational spectra of structural elements of potassium alum — the complexes [Al(H2O)63+ and [Al(D2O)6]3+ — have been calculated. The vibrational spectra have been interpreted based on the calculation and factor-group analysis data. The spectral data obtained point to the fact that, in the crystals considered, the sulfate ions are partially disordered and there exist two crystallographically different types of water molecules. |
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| Keywords: | vibrational spectrum crystal sulfate alum crystalline hydrate |
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