Abstract
The optical properties of Mn 2+ ions have been extensively investigated in numerous host materials. The 3 d 5 electrons associated with the manganese ion are sensitive to crystal field and the optical transitions yield valuable information on the local environment. Thus, the Mn 2+ ion optical spectra in fluorozirconate and fluorohafnate glasses suggest that these ions are in positions of low crystal field. Most likely Mn 2+ substitutes for Ba 2+ ions in these glasses. As the glass undergoes devitrification the Mn 2+ ion spectrum changes suggesting that optical methods can be used for studying the temperature dependence of glass transitions.
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