Infrared and infrared emission spectroscopy of the zinc carbonate mineral smithsonite
Frost, Ray L., Martens, Wayde N., Wain, Daria L., & Hales, Matthew C. (2008) Infrared and infrared emission spectroscopy of the zinc carbonate mineral smithsonite. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 70(5), pp. 1120-1126.
Infrared emission and infrared spectroscopy has been used to study a series of selected natural smithsonites from different origins. An intense broad infrared band at 1440 cm-1 is assigned to the ν3 CO32- antisymmetric stretching vibration. An additional band is resolved at 1335 cm-1. An intense sharp Raman band at 1092 cm-1 is assigned to the CO32- symmetric stretching vibration. Infrared emission spectra show a broad antisymmetric band at 1442 cm-1 shifting to lower wavenumbers with thermal treatment. A band observed at 870 cm-1 with a band of lesser intensity at 842 cm-1 shifts to higher wavenumbers upon thermal treatment and is observed at 865 cm-1 at 400 degrees Celsius and is assigned to the CO32- ν2 mode. No ν2 bending modes are observed in the Raman spectra for smithsonite. The band at 746 cm-1 shifts to 743 cm-1 at 400 degrees Celsius and is attributed to the CO32- ν4 in phase bending modes. Two infrared bands at 744 and around 729 cm-1are assigned to the ν4 in phase bending mode. Multiple bands may be attributed to the structural distortion ZnO6 octahedron. This structural distortion is brought about by the substitution of Zn by some other cation. A number of bands at 2499, 2597, 2858, 2954 and 2991 cm-1 in both the IE and infrared spectra are attributed to combination bands.
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