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Modified Angell Plot of Viscous Flow with Application to Silicate and Metallic Glass‐Forming Liquids
Author(s) -
KozmidisPetrović Ana F.
Publication year - 2014
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/ijag.12062
Subject(s) - fragility , arrhenius plot , materials science , thermodynamics , plot (graphics) , glass transition , physics , kinetics , mathematics , composite material , polymer , quantum mechanics , statistics
The behavior of the Vogel–Fulcher–Tammann ( VFT ), Avramov and Milchev ( AM ) and Mauro, Yue, Ellison, Gupta and Allan ( MYEGA ) functions of viscous flow in relation to t = T g /( T−T o ) is analyzed, where T g is glass transition temperature and T o is the temperature in the VFT equation at which the configurational entropy becomes zero. The T g ‐scaled Arrhenius plot (the Angell plot) has been modified. The log η − ( T g / T ) relationships in the Angell plot were modified as log η–( T g )/( T−T o ) relationships ( T g ‐ scaled VFT plot). The values of parameter m 1 = d(log η)/d t │ T=Tg for some silicate and metallic glass‐forming liquids are presented too. The parameter m 1 still exhibits “fragility” effect as does the kinetic fragility parameter m = d(log η)/d ( T g / T )│ T=Tg in the Angell plot. The plot of log η VFT in relation to t = T g /( T−T o ) is the linear function unlike the Angell plot. The dependences of log η MYEGA and log η AM on t are not linear. It is possible to present the dependences of log η as functions of m 1 and t in the form of 3D graphs.