Raman spectroscopy of hydroxy nickel carbonate minerals nullaginite and zaratite
Frost, Ray L., Reddy, B. Jagannadha, & Dickfos, Marilla J. (2008) Raman spectroscopy of hydroxy nickel carbonate minerals nullaginite and zaratite. Journal of Raman Spectroscopy, 39(9), pp. 1250-1256.
Raman spectroscopy combined with infrared spectroscopy has been used to study the minerals, nullaginite and zaratite. Raman bands are observed at 3650, 3556 and 3309 cm-1 for nullaginite and 3609, 3516 and 3336 cm-1 for zaraitite. By using a Libowitzky type empirical function estimation of the hydrogen bond distances of the OH and water units has been made and values vary from 0.268nm to 0.332nm. Hydrogen bond distances of OH units are less than for water units. The observation of multiple asymmetric stretching and bending modes for nullaginite suggests the carbonate is strongly distorted in contrast to zaratite for which only single bands are found. Raman bands at around 935 and 980 cm-1 are assigned to OH deformation modes.
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