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Correlation Between Thermodynamic and Kinetic Properties of Glass-Forming Liquids

Published online by Cambridge University Press:  01 February 2011

Oleg N. Senkov  and
Daniel B. Miracle
Oleg N. Senkov
Affiliation:
oleg.senkov@wpafb.af.mil, UES, Inc., Materials and Processes Division, 4401 Dayton-Xenia Rd., Dayton, OH, 45432-1894, United States, 937-255-1320, 937-656-7292
Daniel B. Miracle
Affiliation:
daniel.miracle@wpafb.af.mil, Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson AFB, OH, 45433, United States
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Abstract

Correlations between three characteristic temperatures: glass transition, Tg, Kauzmann, Tk, and Vogel-Fulcher-Tammann, To, were identified from the analysis of more than 60 metallic and non-metallic glass-forming materials. It was found that Tg ≥ Tk ≥ To and Tk is the geometric mean of Tg and To. The relation Tk ≥ To indicates that the excess total entropy of a super-cooled liquid ΔS approaches zero at a higher temperature than the configurational entropy ΔSconf, and such behavior was explained by the stronger temperature dependence of the excess vibrational entropy of the liquid, ΔSvib, than that of the corresponding glass, . A relationship between the fragility index m, reduced excess heat capacity ΔCp(Tg)/Sm, and reduced glass transition temperature, Trg, was identified using the found correlation between the characteristic temperatures.

Keywords

amorphouskineticsliquid
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1048: Symposium Z – Bulk Metallic Glasses–2007 , 2007 , 1048-Z02-10
Copyright
Copyright © Materials Research Society 2008

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