Conductivity measurement and dielectric, impedance and modulus spectroscopic studies on bis (P-nitrophenol) melaminium monohydrate

The present work is aimed to study the dielectric and electrical characteristics of bis (P-nitrophenol) melaminium monohydrate (BNPM) over the temperature and frequency ranges of 333-453 K and 50 Hz-5 MHz, respectively. The dielectric properties such as dielectric constant (epsilon '), dielectric loss (epsilon ''), ac-conductivity (sigma ac), real (M ') and imaginary part (M '') of dielectric modulus were investigated as a function of temperature and frequency. The impedance analysis has been carried out using Cole-Cole plots to elucidate the electrical conduction mechanism. Further, observations indicated that the grain boundaries are more resistive and capacitive than the grains, inducing inhomogeneity in the material, which, in turn, causes broad frequency-dependent dielectric anomalies. The observed frequency-dependence of the AC conductivity validated the Jonscher power law. Further, an asymmetric dispersion peak in the imaginary part of the electrical modulus (M) was noticed, indicating that the fabricated material exhibits non-Debye relaxation behavior.

Automated summary

The dielectric and electrical characteristics of BNPM were studied over a range of temperatures and frequencies. The dielectric properties, such as dielectric constant, dielectric loss, ac-conductivity, and dielectric modulus, were investigated as a function of temperature and frequency. Impedance analysis revealed that the grain boundaries were more resistive and capacitive than the grains, leading to frequency-dependent dielectric anomalies. The frequency-dependent AC conductivity followed the Jonscher power law, and an asymmetrical dispersion peak in the imaginary part of the electrical modulus indicated non-Debye relaxation behavior.