On the temperature dependence of a.c. conduction in chalcogenide glasses

Exploring bismuth-doped polycrystalline ceramic Ba0.75Bi0.25Ni0.7Mn0.3O3: synthesis, structure, and electrical properties for advanced electronic applications

This manuscript investigates the structural and electrical properties of a Ba0.75Bi0.25Ni0.7Mn0.3O3 (BNMO) perovskite compound synthesized through the sol-gel method. The orthorhombic crystal structure of the sample is confirmed by X-ray diffraction analysis. The electrical conductivity of BNMO is found to increase with frequency, indicating the presence of local charge carriers. The AC electrical conductivity follows Jonscher's equation, exhibiting a plateau at low frequencies and a power-law behavior at high frequencies. The activation energy for conduction is determined to be 0.654 eV. Impedance spectroscopy reveals the presence of grain and grain boundary contributions, which are modeled using an R-CPE combination circuit. Analysis of the electrical modulus demonstrates non-Debye type relaxation and indicates the presence of charge carrier hopping between Mn2+ and Mn3+ ions. The activation energy obtained from the relaxation peaks of the modulus is found to be 0.674 eV. The dielectric constant exhibits high values that increase with temperature. This observation suggests that the capacitance behavior holds promising potential for energy storage applications, making it a suitable candidate for various technological uses.

Electrical response of organic molecule supported preformed and in situ formed antimony sulfide nanoparticles under frequency conditions

A complexation route mediated synthesis of orthorhombic antimony sulfide nanoparticles is described in this report where uniformly distributed particles within the size range of 2-12 nm are stabilized within the aniline matrix. The organic-inorganic hybrid system was investigated for dielectric capacitance and electric field-induced polarization performances under varying temperature and frequency conditions. The AC-conductivity revealed a correlated barrier hopping conduction mechanism in the hybrid system. A fatigue free polarization was achieved under the electric field of 9 kV mm^-1 for the preformed antimony sulfide system with a stable value of 0.18 μC cm^-2. The in situ dielectric capacitance and field dependent polarization measurements were also performed for the in situ synthesized antimony sulfide using the antimony-aniline complex as the precursor.

Enhancement of polaron-hopping-based a.c. conduction in semiconducting STS (Se-Te-Sn) glass by silver incorporation

In the present work, we have synthesized novel Se78-xAgxTe20Sn2 (0 ≤ x ≤ 6) semiconducting glasses for improving thermally activated a.c. conduction in STS glass (x = 0). The results of the experimental analysis of thermally activated a.c. conduction have been reported in terms of frequency and temperature of Se78-xAgxTe20Sn2 (0 ≤ x ≤ 6) glasses. The frequency dependent experimental data of a.c. conductivity σac show that σac follows the Jonscher universal power law. Variation of a.c. conductivity with temperature obeys the Arrhenius relation. Further analysis confirms that the density of defect states can be determined on the basis of a correlated barrier hopping model using the frequency/temperature dependence of a.c. conductivity σac (T,ω). The analysis of composition dependence of various electric parameters like potential barrier height Wm, hopping distances Rmin and Rω, dielectric constant (ε') and the density of defect states N shows that hopping conduction is improved after silver incorporation into the parent glass. This is explained in terms of a dipolar model by considering the dipoles of Ag+ ions with negatively charged defect states.

Study of dielectric relaxation and thermally activated a.c. conduction in lead containing topological glassy semiconductors

Illustration of CBH model of the Coulombic well.