Modified Angell Plot of Viscous Flow with Application to Silicate and Metallic Glass‐Forming Liquids

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.