DOI: 10.1063/1.4826463. Superstrong nature of covalently bonded glass-forming liquids at select compositions

Superstrong nature of covalently bonded glass-forming liquids at select compositions

10.1063/1.4826463

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Variation of fragility (m) of specially homogenized GexSe100−x melts is established from complex speciﬁc heat measurements and shows that m(x) has a global minimum at an extremely low value (m = 14.8(0.5)) in the 21.5% &lt; x &lt; 23% range of Ge. Outside of that compositional range, m(x) then increases ﬁrst rapidly and then slowly to about m = 25–30. By directly mapping melt stoichiometry as a function of reaction time at a ﬁxed temperature T &gt; Tg, we observe a slowdown of melt-homogenization by the super-strong melt compositions, 21.5% &lt; x &lt; 23%. This range furthermore appears to be correlated to the one observed between the ﬂexible and stressed rigid phase in network glasses. These spectacular features underscore the crucial role played by topology and rigidity in the properties of network-forming liquids and glasses which are highlighted when fragility is represented as a function of variables tracking the effect of rigidity. Finally, we investigate the fragility-glass transition temperature relationship, and find that reported scaling laws do not apply in the flexible phase, while being valid for intermediate and stressed rigid compositions.

Bibliography

Gunasekera, K., Bhosle, S., Boolchand, P., & Micoulaut, M. (2013). Superstrong nature of covalently bonded glass-forming liquids at select compositions. The Journal of Chemical Physics, 139(16).

Authors 4

K. Gunasekera (first)
S. Bhosle (additional)
P. Boolchand (additional)
M. Micoulaut (additional)

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Dates

Type	When
Created	11 years, 10 months ago (Oct. 29, 2013, 8:41 p.m.)
Deposited	2 years, 2 months ago (June 19, 2023, 6:38 p.m.)
Indexed	1 hour, 11 minutes ago (Sept. 7, 2025, 1:17 p.m.)
Issued	11 years, 10 months ago (Oct. 28, 2013)
Published	11 years, 10 months ago (Oct. 28, 2013)
Published Online	11 years, 10 months ago (Oct. 29, 2013)
Published Print	11 years, 10 months ago (Oct. 28, 2013)

Funders 0

None

BibTeX

@article{Gunasekera_2013, title={Superstrong nature of covalently bonded glass-forming liquids at select compositions}, volume={139}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.4826463}, DOI={10.1063/1.4826463}, number={16}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Gunasekera, K. and Bhosle, S. and Boolchand, P. and Micoulaut, M.}, year={2013}, month=oct }

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