Structural origin of fragility in Ge-As-S glasses investigated by calorimetry and Raman spectroscopy.

@article{Yang2015StructuralOO,
  title={Structural origin of fragility in Ge-As-S glasses investigated by calorimetry and Raman spectroscopy.},
  author={Yan Yang and Bin Zhang and Anping Yang and Zhiyong Yang and Pierre Lucas},
  journal={The journal of physical chemistry. B},
  year={2015},
  volume={119 15},
  pages={5096-101}
}
The fragility index (m) of a series of Ge-As-S glasses covering a wide range of mean coordination (⟨r⟩) and stoichiometry is measured by differential scanning calorimetry. The evolution of the fragility index appears to be better predicted by the stoichiometry than the mean coordination, and m shows a well-defined dependence on the departure from stoichiometry quantified as the at. % excess or deficiency in sulfur. The effect of stoichiometry on the fragility of Ge-As-S glasses is very similar… CONTINUE READING
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