From electric to kinetic study of the β ₁–β ₂ transition phase in parylene N thin films

AC-conductivity measurements using dielectric spectroscopy are performed at a temperature of 260 °C on parylene N films during the isothermal β 1 – β 2 phase transition. The charge dynamic is used as the electrical marker to probe the phase transition. During this latter, a decrease of one order of magnitude is observed for the conductivity below the cut-off frequency f c with constant values reached after 300 min. Below the cut-off frequency, the decrease of the normalized conductivity vs time is frequency independent, this behavior is similar to this observed in the case of the f c values. Above the cut-off frequency, the conduction mechanism is affected by the phase transition, the Jonscher power exponent n hf shows a variation comparable to this of f c . These extracted parameters seem to be useful to probe this transition and to reach materials properties stability.