Diffusion of Cu⁺ ions in binary phosphate glasses

The diffusion of Cu⁺ ions into phosphate glasses with different modifiers MgO, CaO, SrO and BaO was studied by the fluorescence method. The peak of the emission spectra of Cu⁺ ions was shifted to a longer wavelength as the ion radius of the modifier increased. The diffusion coefficient of Cu⁺ ions was smallest for magnesium phosphate glasses, increasing with the increase of the ionic radius of the network modifier.