Various additives influence the physical properties of the crystals like growth kinetics [5,6] and surface morphology of the crystal faces [7,8]. The capture of an impurity in a crystal during its growth from a solution is the combined effect of various factors: the solubility of the host and the impurity phase, character of the mother phase, interaction between the host and the impurity molecules, relative size of impurity and host ions, similarity in the crystallographic structure of the two phases, relative size of the impurity and the host ions and other crystallization conditions [9]. The impurity effect depends on the impurity concentration and supersaturation, temperature and the pH of the solution.