Synthesis of vaterite by carbonation process in aqueous system

The synthesis of vaterite was attempted by carbonation process (Ca(OH)(2) + CO2 --> CaCO3 + H2O) in aqueous systems with addition of organic compounds having amino group or carboxyl group snch as amine, carboxylic acid salt and amino acid salt. Sodium L-glutamate, sodium L-aspartate and ethylenediamine are effective for crystallization of vaterite from amorphous calcium carbonate (ACC), as an initial product. ACC gradually crystallized to vaterite while releasing the additive and H2O contained in ACC, under the absence of OH- species in the liquid phase. The existence of OH- in the liquid phase prevented strongly the formation of vaterite from ACC.