Figure 8.

Temperature dependences of the fitting parameters from the best fits of the $C^{″}$ vs. $C^{\prime }$ data to Equations (5) and (6), respectively. (a) High frequency limit of the capacitance $C_{\infty }=\underset{\omega \tau \gg 1}{\lim }{C}^{\prime }\left(\omega \right)$. The solid lines are to guide the eyes. (b) Relaxation strength $\mathsf{\Delta }C=C_S-C_{\infty }$. The dashed lines anticipate possible dependences around the phase transition point. (c) Shape parameters β (black squares) and $\alpha$ (red squares). The solid lines are to guide the eyes. (d) Cole–Davidson ${\tau }_{CD}$ and Cole–Cole ${\tau }_{CC}$ relaxation times (black and red squares respectively). The solid lines represent the best fit to Arrhenius law $\tau ={\tau }_{0}exp\left(E_a/k_{B}T\right)$ with ${\tau }_0=2.31\left(28\right)\mathsf{·}{10}^{-10}$ s and $E_a=0.2708\left(18\right)$ eV for the black curve, and ${\tau }_0=0.30\left(13\right)\mathsf{·}{10}^{-10}$ s and $E_a=0.322\left(12\right)$ eV for the red one. For comparison, the relaxation time ${\tau }_{\max }$, determined from the maximum of the imaginary part of the capacitance (green open squares), is shown.