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Vogel-Fulcher-Tamman plot

Fig. 2.23 Vogel-Fulcher-Tamman-Hesse plots for P2tBCHM ( ) and P4tBCHM ( ). (From ref. [32])... Fig. 2.23 Vogel-Fulcher-Tamman-Hesse plots for P2tBCHM ( ) and P4tBCHM ( ). (From ref. [32])...
The Arrhenius plot of the viscosity of the ILs is not a straight line but a Vogel-Fulcher-Tamman (VFT) type curve. Since ionic conductivity is the inverse of the viscosity (Eq. (3.8)), it also obeys the VFT equation. [Pg.69]

Since most of ILs including polymer systems show upper convex curvature in the Arrhenius plot, and not a straight line, the temperature dependence of the ionic conductivity is expressed by Vogel-Fulcher-Tamman (VFT) equation [7] ... [Pg.78]

It was shown in Figure 12.4 that, in the case of glass-rubber relaxation, the linearity of the plot of peak E" or the peak of tan d versus the reciprocal of the peak temperature, was lost. Consequently, the Vogel-Fulcher-Tamman-Hesse... [Pg.371]

To see more clearly the temperature effect on ion conduction, the logarithmic molal conductivity was plotted against the inverse of temperature, and the resultant plots showed apparent non-Arrhenius behavior, which can be nicely fitted to the Vogel— Tamman-Fulcher (VTF) equation ... [Pg.83]

The importance of polymer segmental motion in ion transport has already been referred to. Although classical Arrhenius theory remains the best approach for describing ion motion in solid electrolytes, in polymer electrolytes the typical curvature of the log a vs. 1/T plot is usually described in terms of Tg-based laws such as the Vogel-Tamman-Fulcher (VTF) [61] and Williams-Landel-Ferry (WLF) [62] equations. These approaches and other more sophisticated descriptions of ion motion in a polymer matrix have been extensively reviewed [6, 8, 63]. [Pg.637]

For the ILs the curvature of the Arrhenius plots are generally observed and the following Vogel-Tamman-Fulcher (VTF) equation (1) have been conveniently used to interpret the results. [Pg.100]


See other pages where Vogel-Fulcher-Tamman plot is mentioned: [Pg.380]    [Pg.326]    [Pg.85]    [Pg.558]    [Pg.263]    [Pg.34]    [Pg.5]   
See also in sourсe #XX -- [ Pg.179 ]




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