Abstract
A study of copper‐containing lead glasses showed that heating such glass above 750°C produced significant amounts of Cu+ ions, which, on subsequent thermal exposure, produced precipitation in the glass. This effect was found to be cumulative with respect to time and temperature. Bubbling oxygen through the glass melt below 1100°C reduced the Cu+ ion concentration. Surface contamination both of the lead glass rods and of the substrate to which they were sealed enhanced the growth of . The mechanism of the precipitation is described.
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