Dielectric behaviour of iron‐doped cellulose acetate films

The effect of iron doping and its concentration on the dielectric properties of cellulose acetate films was studied as a function of temperature (range 300–440 K) and frequency (range 10 kHz‐10 MHz). Undoped films exhibited a peak near 350 K in the capacitance versus temperature plots, while the dielectric loss exhibited two peaks. The dielectric capacitance decreased with increased dopant concentrations while the dielectric loss showed an increase. The peak positions, however, shifted towards higher temperatures in both cases. Presence of dopant ions and formation of charge transfer complexes/molecular aggregates are suggested as the possible reasons for this behaviour.