To obtain high quality colloidal crystals, control of impurity behavior during crystallization is required. We have investigated impurity partitioning quantitatively for the colloidal crystal. We applied conventional partition model of normal crystal growth such as Thurmond and Struthers model and Burton Prim Slichter (BPS) model to colloidal crystal growth, which provides equilibrium partition coefficient (k0). Discussion on the basis of free energy derived from volume fraction of colloidal particles well account for variation of k0s for impurity of different size. In-situ observation revealed detailed partition behavior, including orientation-dependency, the effect of the grain boundary, and the morphology of solid-liquid interface. These new findings contribute to constructing methodology for growing high quality colloidal crystal as well as understanding general concept of partitioning that takes place during phase transition.
