Abstract: In this study, the structure of nanocrystalline CaCO₃ was analyzed using TEM, SEM, FT-IR and XRD measurements. An unusually narrow v₃ band with remarkable blue shift about 40 cm^-1 in the infrared spectrum was observed. XRD analysis revealed a somewhat large crystallite strain in the nano-particle CaCO₃. The strain was possibly related to the weakened lattice vibration. This suggests a preliminary explanation for the abnormal IR assimilation characteristics of nanocrystalline CaCO₃ aforementioned.

Key words: nanocrystalline calcite, distortion of crystal lattice, infrared behavior

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