Response to "Comment on 'A model for phosphate glass topology considering the modifying ion sub-network"' [J. Chem. Phys. 142, 107103 (2015)

The Journal of Chemical Physics
Christian HermansenYuanzheng Yue

Abstract

In our recent paper [C. Hermansen, J. C. Mauro, and Y.-Z. Yue, J. Chem. Phys. 140, 154501 (2014)], we applied temperature-dependent constraint theory to model the glass transition temperature (Tg) and liquid fragility index (m) of alkali phosphate glasses. Sidebottom commented on this paper concerning the m values obtained by differential scanning calorimetry (DSC) [D. L. Sidebottom, J. Chem. Phys. 142, ⬛ (2015)]. We have considered Sidebottom's comments carefully and conclude that the m values of phosphate liquids obtained by DSC are reliable, except for the NaPO3 and possibly P2O5 compositions. Based on his dynamic light scattering measurements, Sidebottom has found that P2O5 is a strong liquid with m ≈ 20. However, based on the heat capacity jump at Tg and the stretching exponent of the relaxation function, P2O5 should be classified as an intermediate fragile liquid with m ≈ 40. We also argue that m cannot be universally related to the average connectivity of the network and point out several inconsistencies with this view.

References

Sep 1, 2006·The Journal of Chemical Physics·Li-Min WangRanko Richert
Mar 31, 1995·Science·C A Angell
Jan 22, 2008·The Journal of Chemical Physics·M D EdigerLian Yu
Nov 12, 2009·Proceedings of the National Academy of Sciences of the United States of America·John C MauroDouglas C Allan
Jan 12, 2010·The Journal of Chemical Physics·Morten M SmedskjaerYuanzheng Yue
Nov 5, 2013·The Journal of Chemical Physics·K GunasekeraM Micoulaut
Jan 3, 2015·The Journal of Chemical Physics·Christian HermansenYuanzheng Yue

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