  CaCO3 crystals' physical properties, such as polymorphism and hence the
reflectivity and stability, are critical factors of their qualities in
industrial applications. Factors such as additives and substrates that
influence CaCO3 polymorphism have been intensively studied. However, the
effects of ionic strength created by varying additives are seldom paid
attention to. This study is analyzing how ionic strength of the growth solution
influences the crystalline structure of CaCO3, by applying growth solutions
containing different types of cations of varying concentrations, K+, Na+, and
NH4+. This study reveals that the ionic strength plays a significant role in
polymorph selection in the way that the percentage of vaterite among the
precipitates increases with the concentration of ionic strength.
