Browsing by Author "K. Yadav, Jaswant"

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    Correlative analysis of electrical-structural properties of 60B2O3.15ZnO. xLi2O.(25-x)Bi2O3 glass system
    (2026) K. Yadav, Jaswant
    The electrical conductivity of 60B2O3.15ZnO.xLi2O.(25-x)Bi2O3 glass system has been measured by complex impedance spectroscopy in the frequency range from 100 Hz to 5 MHz and temperature range 623-723 K with varying Li2O concentration. Experimentally observed data of ac conductivity is fitted with Jonscher’s power law, and conductivity parameters viz. crossover frequency (ωH), frequency exponent (s), dc conductivity (σdc), enthalpy of formation (Hf), and migration (Hm) of the Li+ ion have been estimated. Quantum Mechanical Electron tunnelling theory of conduction mechanism is found applicable in these glasses. At a given temperature, conductivity increases with Li2O content. The stretch parameter ‘β’ is observed to be temperature-dependent, and its value increases with a rise in Li2O content (β is 0.829 for x=10 and 0.928 for x=25 at 663 K), which signifies increased structural homogeneity and a smaller distribution of relaxation times. Relaxation time estimated from both electric modulus (τM") and impedance (τZ") decreases with an increase in Li2O content. With Li2O content, experimental values of dc (Edc) and ac (Ez) activation energies of the studied glass system follow similar behaviour as the total concentration of tetrahedral BO4 units (N4). An increase in the N4 fraction signifies a decrease in the activation energy for ionic conductivity.