Abstract
Abstract The effect of rare earth ions on the thermal stability of AlF 3 -based glasses has been investigated. Different concentrations of NdF 3 , ErF 3 and PrF 3 ranging from 0.25 to 2.0 wt% have been added to a well characterized base glass. Differential scanning calorimetry (DSC) measurements were carried out to determine the time-temperature-transformation (TTT) curves, critical cooling rates and Hruby parameters for both the base glass as well as for the selectively doped glasses. It was found that the thermal stability of AlF 3 -based glasses actually increased following the addition of the above rare earth ions up to certain concentrations and then started to gradually decrease but still remained higher than the original base glass. This behavior of AlF 3 -based glasses is in contrast to those based on ZrF 4 and may offer certain advantages in the fabrication of active fiber devices.
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