Author/Authors :
Brom، نويسنده , , H.B. and Adriaanse، نويسنده , , L.J. and Teunissen، نويسنده , , P.A.A. and Reedijk، نويسنده , , J.A. and Michels، نويسنده , , M.A.J. and Brokken-Zijp، نويسنده , , J.C.M.، نويسنده ,
Abstract :
We have measured the frequency ω/2π dependence of the complex conductivity (σ′ and σ′ʹ) of conducting composites of carbon-black particles in a non-conducting polymer matrix up to 0.6 THz. The concentration p ranges from just above the percolation threshold pc up to 33pc. Temperatures T were varied between 4.2 K and 300 K. When scaled to σDC, σ′(T, ω) shows a unique dependence on ω, independent of T. We show how this relation follows from the hopping mechanism and relate the data to the microscopic hopping parameters.
