Ac conductivity and dielectric properties of hexanoyl chitosan-LiClO4-TiO2 composite polymer electrolytes

Hexanoyl chitosan: LiClO4: TiO2 composite electrolyte films were prepared by the solution cast technique. The ac conductivity and dielectric properties of the samples prepared have been studied in the frequency range from 100 Hz to 1 MHz over the temperature range from 273 to 333 K. The exponent s in the Jonscher's universal power law, sigma(omega) = sigma(dc) + A omega(s) was analyzed as a function of temperature and the analysis suggests that the conduction mechanism can be interpreted based on the correlated barrier hopping (CBH) model. The barrier heights, W-M were calculated. The values of W-M are found to decrease with increasing temperature in the same manner as the exponent s. Both dielectric constant and dielectric loss decrease with increase in frequency and increase with increase in temperature.