Extent of oxide compounds dissociation and nucleation kinetics in melts of the Bi2O3-GeO2 systems: experimental study and theoretical analysis

The thermodynamic simulations of the phase equilibrium, of the extent of the complex oxide compounds dissociation at melting, in overheated and super-cooled melts have been carried out in models of ideal, regular and sub-regular solutions on the base of the experimental data for the binary oxide system Bi2O3-GeO2. The rules of the crystal formation in these melts have been discussed theoretically and compared with the experimental data. It is shown that the dissociation phenomena affect essentially upon nucleation kinetics and possibility of different crystalline phase formation in the oxide systems.