Crystallization of CaCO3 from Ca (NO3) 2 Solution. II. Effect of Metallic Ions on Phase and Morphology of CaCO3

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On crystallization of CaCO3 from Ca (NO3) 2 aqueous solution by homogeneous precipitation technique, the effect of Mg2+, and Ba2+ ions on the morphology of CaCO3 was studied at 90°C. The results are as follows : (1) The presence of Mg2+ ion inhibited a transformation of needle-like aragonite into calcite. Mg2+ ion did not form a solid solution with CaCO3. (2) The presence of Ba2+ ion stimulated the formation of plate-like vaterite. Vaterite transformed into, calcite at 90°C but into both calcite and aragonite at room temperature. Ba2+ ion did not form a solid solution with CaCO3. (3) The particle diameter of needle-like aragonite decreased with addition of Mg2+ ion. There is the optimum amount of Mg (NO3) 2 addition to obtain aragonite crystals with uniform size.
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