Abstract
Glasses containing cuprous ions and halides are heated. In some of the glasses, the precipitation of cuprous halides gives rise to excitonic absorption. Electron micrographs and leaching studies fail to show a correlation between the precipitation of the cuprous halides and phase separation of the matrix glass into silica rich and boron rich regions. Correlation with previously discussed models of the dependence of halogen solubility on the bonding of boron atoms is evident.
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