Abstract
The nucleation process of Zn-65(OH)(2), Zn-65(3)(PO4)(2), and (CrPO4)-Cr-51 crystals in gelatin and agar was studied by using radioactive tracers. The diffusion rate constants for Zn-65(2+) and Cr-51(3+) cations through gel and the reaction rate constants of nucleation process as well as the beginning time of crystal appearance were established. It was found that the reaction rate constant of the low-soluble crystal is higher, and, consequently, in a given colloidal medium this parameter varies as follows:
k(*Zn(PO4)2) > k(*Zn(OH)2) > k*(CrPO4)