| Autor: |
C. Benhamideche, A. Boutarfaia, M. Poulain |
| Jazyk: |
English<br />French |
| Rok vydání: |
2015 |
| Předmět: |
|
| Zdroj: |
Journal of Fundamental and Applied Sciences, Vol 5, Iss 1, Pp 14-24 (2015) |
| Druh dokumentu: |
article |
| ISSN: |
1112-9867 |
| DOI: |
10.4314/jfas.v5i1.2 |
| Popis: |
The kinetics of devitrification of fluoride glasses stabilized by magnesium fluoride when heated for some time between the glass transition and melting temperatures. The crystallization kinetics of AlF3-YF3-PbF2-CdF2-MgF2 glass prepared by melting the halide powders were studied by differential scanning calorimetry (DSC). The heating rate varied between 2 and 10 Kmim-1. Arami’s exponent (n) obtained by a non-isothermal method was 1.5 and 2.5 for a AlF3-YF3-PbF2-CdF2-xMgF2 (x= 0, 5, 10) and n > 2.5 for a AlF3-YF3-PbF2-CdF2-15MgF2. According to the classical interpretation of n, these magnitudes correspond to diffusion controlled growth of crystals. The activation energies for crystallization, (E), varied from 195-326 KJ/mol. These results confirm the improved stability of these glasses, which could be used as base glasses for low phonon energy fluoride glass fibers. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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