Diffusion of zinc, cadmium, strontium, lead, barium, divalent cations in silicate glasses

Abstract

Diffusion of zinc, cadmium, strontium, lead, barium divalent cations from molten halide or nitrate salts into soda-lime-aluminosilicate glasses was investigated at 580 to 640 °C. The diffusion concentration of these divalent cations in the glass surface was measured by ion microprobe analysis. The results show that the diffusion coefficients (D*) , frequency factors (D0) and activation energies (E) of divalent cations depend on their ionic radii. The diffusion coefficients decrease with the ionic radii increasing; one can state that D* Zn > D* Cd > D* Sr > D* Pb > D* Ba. But the diffusion activation energies and frequency factors of divalent cations increase with their ionic radii increasing. The influence of ionic field strength and polarization on diffusion behavior is also discussed.