抄録
This study was undertaken to investigate the effect of some addition agents dissolved in the super-saturated potassium chloride solution for altering the nucleation rate of potassium chloride. Following results were obtained:
1. A small amount of addition agent such as a mixture of MnCl2 and (NaPO3) n being dissolved in the supersaturated KCl solution, KCl grows up as a single crystal with large octahedral shape. In this case, the waiting time determined by the conductmetric. instrument-the time required for the formation of the first nucleus-is prolonged; namely the frequency of the formation of the crystal nuclei is reduced.
2. Values of activation energies, surface free energies and nucleus sizes calculated by substituting the term of the waiting time in the nucleation rate equation respectively, are increased as a result of the effect of the above agent.
From those results it is considered that the above agent behaves as if a negative catalyst in the nucleation of KCl, and so a small number of large KCl crystals deposite from the growth solution.
