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Smith, Anita
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Publications (6/6 displayed)
- 2014Relative contribution of stoichiometry and mean coordination to the fragility of Ge-As-Se glass forming liquidscitations
- 2011Structure and physical properties of Gex Asy Se 1-x-y glasses with the same mean coordination number of 2.5citations
- 2008Properties of GexAsySe1-x-y glasses for all-optical signal processingcitations
- 2007Properties and structure of Ag-doped As2Se3 glassescitations
- 2007Optical properties and structural correlations of GeAsSe chalcogenide glassescitations
- 2006Optical characterization of Ge-As-Se glasses containing high content of germaniumcitations
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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>