Studies of electric, dielectric properties, and conduction mechanism of {(C₂H₁₀N₂)(MnCl (NCS)₂)₂}_n polymer

Abstract

Dielectric and electrical properties correlated with the structure analysis have been studied for new crystalline polymer {(C 2 H 10 N 2)(MnCl (NCS) 2) 2 } n. The frequency and temperature dependence of dielectric constant (ε 0), dielectric loss (ε 00) and loss tangent (tanδ) in the temperature range 308-348 K and frequency range 20 to 2 MHz have been made for {(C 2 H 10 N 2)(MnCl (NCS) 2) 2 } n. The Z 0 and Z 00 versus frequency plots are well fitted to an equivalent circuit model.

Poly (aniline-co-aniline-2,5-disulfonic acid) / L-ascorbic acid / Ag@SiO2 / polysafranin nanocomposite: Synthesis, characterization and anomalous electrical behaviour

“…It is observed that S tends to increase with increasing temperature. This behaviour is due to non-overlapping small polaron tunnelling [37,38]. This s variation as a function of temperature is consistent with a thermally triggered process.…”

“…where M' and M'' are the real and imaginary parts of the complex modulus and are defined by the equations ( 5) and ( 6), respectively [38].…”

“…The phase transition is accompanied by a rapid decrease of 'ac in the temperature (>363 K). It is more than likely that this effect camouflages the expected relaxation process [38].…”

“…16 Generally, the relation [σ'ac (ω,T) = Aω s(ω,T) ] represents the electric conductivity described by the Jonscher power law model, and s(T) represents the power exponent which depends on the temperature satisfying the condition 0 ≤ s(T) ≤ 1. In the case of polymers, the relaxation processes analysis through this formalism is not applicable, especially at low frequencies and high temperatures, because the dc conductivity phenomenon hides any relaxation process [38]. To avoid such obstacle, the electric modulus formalism was defined as the inverse of the relative complex permittivity ε*(ω,T) as calculated as given in equation ( 4) [40].…”

“…To study the electrical relaxation behaviour of conducting materials, electrical modulus characterization is commonly used. The complex electric modulus is measured by the inverse of the complex permittivity [38,41]. The electric modulus analysis eliminates unwanted capacitance effects caused by electrode contacts and gives a good picture of the dc conduction and dipole relaxation.…”