Controls of polymorphism and morphology of calcium carbonate compounds formed by crystallizing amorphous calcium carbonate hydrate

Abstract

The control of the polymorphism and morphology of calcium carbonate compounds were studied by suspending amorphous calcium carbonate hydrate (ACC) powder in MgCl2 solution in different conditions, such as temperature, pH and MgCl2 concentration. The characteristics of calcium carbonate compounds formed from ACC were determined by means of X-ray diffraction, thermal analysis and scanning electron microscopic observation.