CaCO_3 was precipitated with NaCO_3/CaCl_2 and CO(NH_2)_2/Ca(CH_3COO)_2 reaction system. The samples were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electronic microscopy (SEM). The obtained results were as follow:
1. The vaterite was synthesized by the templating method with anionic surfactants SDBS. The rhombohedral calcite crystal was obtained in the absence of SDBS. As the SDBS concentration was increased to 0.5mM, the sample consist...