A Raman spectroscopic comparison of calcite and dolomite

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• 作者：Junmin Sun ; Zeguang Wu ; Hongfei Cheng ; Zhanjun Zhang ; Ray L. Frost
• 关键词：Raman spectroscopy ; Carbonate ; Calcite ; Dolomite
• 刊名：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
• 出版年：3 January, 2014
• 年：2014
• 卷：117
• 期：Complete
• 页码：158-162
• 全文大小：630 K

文摘

Raman spectroscopy was used to characterize and differentiate the two minerals calcite and dolomite and the bands related to the mineral structure. The (CO₃)^{2鈭?/sup> group is characterized by four prominent Raman vibrational modes: (a) the symmetric stretching, (b) the asymmetric deformation, (c) asymmetric stretching and (d) symmetric deformation. These vibrational modes of the calcite and dolomite were observed at 1440, 1088, 715 and 278 cm鈭?. The significant differences between the minerals calcite and dolomite are observed by Raman spectroscopy. Calcite shows the typical bands observed at 1361, 1047, 715 and 157 cm鈭?, and the special bands at 1393, 1098, 1069, 1019, 299, 258 and 176 cm鈭? for dolomite are observed. The difference is explained on the basis of the structure variation of the two minerals. Calcite has a trigonal structure with two molecules per unit cell, and dolomite has a hexagonal structure. This is more likely to cause the splitting and distorting of the carbonate groups. Another cause for the difference is the cation substituting for Mg in the dolomite mineral.}