Effect of Bi2O3 on electrical properties of lithium borate and lithium borosilicate glass systems

Document Type : Original Article

Authors

1 phyyiscs department,faculty of science, girls branch, alazhar university,cairo,eygpt

2 phyyiscs department,faculty of science, boys branch, alazhar university,cairo,eygpt

Abstract

This study explores the dielectric characteristics and alternating current conductivity of bismuth glasses that contain borate and borosilicate, which are doped with a fixed amount of CoO and Li2O, while the concentration of Bi2O3 varies ((59─x)B2O3─xBi2O3─40Li2O─1CoO)&((49─x)B2O3─xBi2O3─10SiO2─40Li2O─1CoO) where x=(0,5,10,20). The glass samples were synthesized by the normal melt quench technique. The electrical conductivity and dielectric response have been analyzed in the range of frequencies (0.1Hz- 108Hz) and temperature range (303ﹾK– 463ﹾK) by employing impedance spectroscopy technique with the aim of knowing the effect of Bi+3 ions on ac conductivity and dielectric properties. It was found that the presence Bi+3 facilities Li+ ions movement because of dual role of Bi+3 as glass modifier in [BiO6] octahedral units and as glass former with [BiO3] pyramidal units which modify the glass matrix structure and as a result affect on electrical conductivity (creating non-bridging oxygen which leads to open pathways in glass matrix for ion migration).  Ac conductivity of all prepared glass systems was well understood on the basis of Jonsher’s universal power low with The frequency exponent (s) reduces as the temperature increases suggesting that the Correlated Barrier Hopping model is the model for clarifying conduction mechanism of the studied glass systems. In the low frequency range, electrical conductivity is independent of frequency having nearly flat plateau region as frequency increases, dispersion starts. It was found that the increase in frequency is matched by a decrease in dielectric constant (ε`) and dielectric loss (ε``) for all examined glass specimens. The peak frequency fmax can be illustrated from dielectric modulus   spectra.

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International Journal of Theoretical and Applied Research
Volume 4, Issue 1
June 2025
Pages 622-631

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