Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

The three-component system CuSO₄-ZnSO₄-H₂O forms three types of solid solution. Metastable zone widths measured for selected solution compositions at two cooling rates were used to calculate the kinetic parameters of nucleation. The rate of crystal growth was measured by the fluidized bed method. The results show that the addition of Zn²⁺ to a solution of CuSO₄ increases both the nucleation and crystal growth rates, whereas Cu²⁺ added to a solution of ZnSO₄ retards the nucleation rate and slightly increases the rate of crystal growth. The nucleation rate (the metastable zone width) is substantially more sensitive to the addition of a second component than is the rate of crystal growth. The crystal growth rate is controlled by a diffusion mechanism.