fig1

Figure 1. (A) Conductivity spectra of [P₁₂][TFSI] in different solid phases and melt states. In the melted state, only standard AC-DC crossover is observed. In the solid phases, the additional step at high frequency is presented (Process I). Red solid lines correspond to RBM and obey Eq. (2). (B) Temperature dependence of DC conductivity estimated at low-frequency DC plateau after Process I. Colored symbols (red and blue) correspond to DC conductivity of the fresh sample from (A). The black symbols correspond to the aged sample measured with a 1K degree step around phase transitions.