Thermal stability, AC electrical conductivity and dielectric properties of N-(5-{[antipyrinyl-hydrazono]-cyanomethyl}-[1,3,4]thiadiazol-2-yl)-benzamide

Add time:08/19/2019    Source:sciencedirect.com

A novel organic compound containing antipyrine and thiadiazole moieties, N-(5-{[antipyrinyl-hydrazono]-cyanomethyl}-[1,3,4]thiadiazol-2-yl)-benzamide (ACTB) has been synthesized. The thermal properties, alternating current electrical conductivity (σAC) and electrical modulus of ACTB have been reported. The thermal properties were analyzed using differential scanning calorimetry and thermogravimetric measurements. The AC measurements of bulk ACTB were performed in frequency range 100 Hz–5 MHz and temperature range 303–503 K. The frequency dependence of AC conductivity is found to follow Jonscher’s universal power law with the applicability of the correlated barrier hopping model. The temperature dependence of σAC could be described in terms of Arrhenius relation with two activation energies. The activation energy decreases with increasing frequency. The dielectric relaxation behavior is explained in terms of electric modulus formalism. At relatively higher temperatures, the imaginary modulus spectra exhibit asymmetric maxima with peak-width much broader than that of the Debye peak and are skewed toward the high frequency sides of the maxima with increasing temperature. The relaxation time is calculated and exhibited thermally activated process with activation energy of 0.77 eV.

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