DSC Studies of Some Bismuth-phosphate Glasses |
| A.A. El-Adawy Physics Department, Faculty of Science, Menuofia University, Egypt |
| Received: November 5, 1997; revised version May 25, 1998 |
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| 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. |
| DOI: 10.12693/APhysPolA.94.661 PACS numbers: 65.40.+g |