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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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Wang, Ting
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2021Methanol degradation mechanisms and permeability phenomena in novolac epoxy and polyurethane coatingscitations
- 2021Methanol degradation mechanisms and permeability phenomena in novolac epoxy and polyurethane coatingscitations
- 2021Pinecone particles filled polybenzoxazine composites: Thermomechanical and mechanical propertiescitations
- 2021Simultaneous tracking of hardness, reactant conversion, solids concentration, and glass transition temperature in thermoset polyurethane coatingscitations
- 2021Simultaneous tracking of hardness, reactant conversion, solids concentration, and glass transition temperature in thermoset polyurethane coatingscitations
- 2020Biomechanical and biological evaluations of novel BPA-free fibre-reinforced composites for biomedical applicationscitations
- 2020Load-dependent path planning method for 3D printing of continuous fiber reinforced plastics
- 2019Measurements of methanol permeation rates across thermoset organic coatings
- 2018Complete long-term corrosion protection with chemical vapor deposited graphenecitations
- 2014Relative contribution of stoichiometry and mean coordination to the fragility of Ge-As-Se glass forming liquidscitations
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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>