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- W2002254972 abstract "The natural gypsum has been investigated by infrared, Raman, X-ray diffraction, optical absorption and electron paramagnetic resonance spectroscopy. The fundamental stretching and bending vibrations observed in the infrared region for SO42− and H2O are compared with the near-infrared overtones and combinations of these vibrations. MIR and Raman spectral features are attributed to sulfate fundamentals and lattice vibrations of H2O, SO42−. The charge transfer and ligand field transition bands were observed near 490, 630, and 800–900 nm and were compared to those of iron oxides. The optical absorption spectrum indicates the presence of ferric and ferrous ions in the mineral. The site symmetry of Fe(III) in the sample is tetragonally distorted. EPR results indicate the presence of the ferric ion in a tetragonally distorted state." @default.
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- W2002254972 date "2009-07-01" @default.
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- W2002254972 title "Infrared, optical absorption, and EPR spectroscopic studies on natural gypsum" @default.
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- W2002254972 doi "https://doi.org/10.1016/j.vibspec.2008.12.004" @default.
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