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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Yang, Zhiyong
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Topics
Publications (8/8 displayed)
- 2021High refractive index IR lenses based on chalcogenide glasses molded by spark plasma sinteringcitations
- 2015Mid infrared supercontinuum generation from chalcogenide glass waveguides and fiberscitations
- 2015Mid infrared supercontinuum generation from chalcogenide glass waveguides and fiberscitations
- 2014Relative contribution of stoichiometry and mean coordination to the fragility of Ge-As-Se glass forming liquidscitations
- 2013Thermoelectric bulk glasses based on the Cu-As-Te-Se systemcitations
- 2010Optical microfabrication of tapers in low-loss chalcogenide fiberscitations
- 2010Composition dependence and reversibility of photoinduced refractive index changes in chalcogenide glasscitations
- 2010Opto-electrophoretic detection of bio-molecules using conducting chalcogenide glass sensors.citations
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article
Relative contribution of stoichiometry and mean coordination to the fragility of Ge-As-Se glass forming liquids
Abstract
<p>The structural relaxation properties of 34 compositions of Ge-As-Se glass forming liquids are investigated by differential scanning calorimetry (DSC). The fragility index (m) and activation energies for enthalpy relaxation (E <sub>a</sub>) exhibit universal trends with respect to stoichiometry and mean coordination (〈r〉), respectively. The liquid fragility which defines the full temperature dependence of the relaxation processes shows no well defined trend with respect to 〈r〉 but instead is found to be closely determined by the excess or deficiency in selenium with respect to stoichiometry. The mean coordination on the other hand appears to be an accurate predictor of the activation energy near the glass transition where most constraints are still intact. No intermediate phase is observed in either case. These results emphasize that chemical effects rather than topological effects appear to control the wide ranging structural mobility of these glass forming liquids. The consequences of these findings in terms of the thermal stability of the corresponding glasses are discussed. It is similarly found that sub-T <sub>g</sub> relaxation is controlled by stoichiometry rather than topology.</p>