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  1. 1 Acta Physica Polonica A

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  1. 1 1998

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  1. 1 El-Adawy A.

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DSC Studies of Some Bismuth-phosphate Glasses

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El-Adawy A.
Acta Physica Polonica A
|
1998
|
vol. 94
|
issue 4
661-670
EN
The differential scanning calorimetry measurements were made on a series of bismuth-iron-phosphate glasses over a temperature range around the glass transition temperature. The activation energy for structural relaxation, ΔH, was determined and found to increase with the metal-to-phosphorus ratio. The differential scanning calorimetry data were analyzed using the Adam-Gibbs-Scherer model of the glass transition. This analysis suggests that these glasses undergo a transition from the strong to the fragile glass regime as the metal-to-phosphorus ratio is increased.
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