Electrical behavior of polycarbonate doped with nickel chloride

Abstract

SYNOPSISThe dc electrical conductivity (u) and permittivity (t') of polycarbonate (PC) discs doped with different concentrations of NiC12 are studied. Both (a) and ( t ' ) increase with increasing the concentration of NiC12, with a maximum value a t 30 wt %. The activation energies for pure and doped PC are 0.49 and 0.53 eV, respectively. The increase in the electrical conductivity with increasing NiC1, concentration is attributed to the formation of chargetransfer complexes (CTC); the increase in t' may be due to the rise in the interfacial polarization which results from the increase in boundaries between P C and NiCI2 phases. The currents in PC discs, both pure and doped with NiC12, in the high-field region are attributed to space charge limited conduction. The time dependence of conduction current before and after reversal of applied voltage is also investigated. Some parameters such as the density of mobile ions and their drift mobilities are estimated. 0 1995