An effective alkali ion diffusion barrier layer was created on glass surfaces by chemically modifying the 100-500 A thick surface layer by boron diffusion. In the modified layer, sodium migration is hindered by interaction of boron with the chemically active sites that facilitates alkali diffusion. Structural studies were conducted by Infrared Reflection Spectroscopy (IRRS), X-ray Photoelectron Spectroscopy (XPS), and Secondary Ion Mass Spectroscopy (SIMS). Concentration of non-bridging oxygens in the modified layer is found to be significantly reduced by boron diffusion. In this presentation, a correlation is made between glass surface chemistry, alkali diffusion, and glass weathering resistance. Finally, modeling and an explanation are offered for the alkali diffusion resistance of the boron modified glass surface.
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