Journal
RSC ADVANCES
Volume 12, Issue 25, Pages 15848-15860Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ra01800d
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Nanoparticles of AgxZn1-xAl2O4-x/2 (x=0.05 and x=0.1) were synthesized and characterized. The structural characterization confirmed the formation of a cubic spinet structure, and the morphological evaluation showed the agglomeration of nanoparticles. Impedance spectroscopy was used to study the electrical behavior, revealing different conductivity models at different temperatures.
In this paper, nanoparticles of AgxZn1-xAl2O4-x/2(x = 0.05 and x = 0.1) were synthesized by the sot-gel auto-combustion method and characterized by various techniques. X-ray diffraction (XRD) for structural characterization confirms the successful formation of a cubic spinet structure with the space group Fd (3) over barm. Their morphology was evaluated with a scanning electron microscope (SEM) which shows an agglomeration of nanoparticles. To characterize the electrical behavior of our compounds, we used impedance spectroscopy at temperatures ranging from 313 K to 653 K and frequencies ranging from 0.1 Hz to 1 MHz. The experimental data for the real and imaginary impedance parts were mounted on the equivalent grain resistance (R-g)//fractal capacitance (CPE) circuit. Indeed, the activation energies extracted from the electrical conductivity and the resistance of the grain resistance (R-g) dosed and confirmed a transformation of the electrical behavior confirmed by a decrease in the resistance of the materials. The study of the alternating conductivity shows a Jonscher curve behavior and a thermally activated conduction process. The variation of the exponent s as a function of temperature shows, on the one hand, the presence of two models of conduction correlated barrier jump (CBH) and non-overlapping small polaron tunneling (NSPT) for x = 0.05 and, on the other hand, a CBH model for x = 0.1.
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