LINEAR AND NONLINEAR CONDUCTIVITY SPECTRA OF TETRAETHYLENE OXIDE ORGANOSILOXANE COPOLYMER LICLO4 COMPLEX

The temperature dependence of the frequency spectra of linear to third -order nonlinear complex conductivities in tetraethylene oxide-organos iloxane copolymer/LiClO4 complexes was measured. At each temperature, a characteristic conduction relaxation phenomenon was observed in the spectra, which suggested the existence of different ion conduction mec hanisms between the low-and high-frequency regions. We found that the ratio of linear to nonlinear conductivities was closely related to the elementary process of ionic transport in the samples. Without the nee d for any additional assumptions, we also found that the ratio obtaine d from nonlinear measurements allowed an estimate of the important par ameters which characterize ionic transport in the samples, such as the size of a connected cluster of the site capable of ion hopping or the hopping distance of ion. (C) 1998 Elsevier Science B.V. All rights re served.