Investigation of electrical and dielectric properties of NaI doped synthesized systems

•Mixed conducting polymeric system is synthesized with solution cast technique.•σ, N, D and μ show Arrhenius type thermally activated behavior before Tm.•Distribution of relaxation time was estimated from Kohlrausch function.•Material is moving toward Debye nature with increasing salt wt.% and temperature.

A polymeric system has been synthesized using Triethylenetetramine (TETA), 1-3 Propane Sultone and Glutaraldehyde (GA) in the ratio 1:1:1. The system is doped with NaI to make it conducting. Its electrical and dielectric properties are discussed in terms of conductivity, mobility and number of charge carriers as a function of salt concentration and temperature. Maximum conductivity (~ 10− 4 S cm− 1) is obtained for 50% NaI containing system. Before melting phase transition (Tm), conductivity, number of charge carriers, mobility and diffusion coefficient are all increasing with temperature and follow Arrhenius nature but after Tm mobility follows a decreasing trend. Both in ε″ vs logω and tanδ vs logω curves peaks become sharper after melting phase transition. Distribution of relaxation time, decreases with increasing temperature and salt concentration, indicating that material has a tendency to achieve Debye type behavior.