Spectroscopic approach to understanding complex impedance in sodium silicate

Q2 Physics and Astronomy Physics Open Pub Date : 2025-02-13 DOI:10.1016/j.physo.2025.100255

Md Ayub Sheikh , Sudhangshu Chakraborty

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Abstract

This study investigates the complex impedance spectroscopy (CIS) of sodium silicate (Na₂SiO₃) across various frequencies and temperatures to examine the influence of grain and grain boundary polarization on its electrical properties. The findings reveal a non-Debye relaxation behavior, deviating from ideal relaxation models typically observed in such materials. Both dielectric relaxation and dispersion effects contribute to the polaron-controlled hopping mechanism evident in the CIS data.The Nyquist plot exhibits a single semicircular arc, indicating that grain boundary polarization is the dominant factor affecting the impedance of sodium silicate. Additionally, the study explores the correlated barrier-hopping model, providing insights into AC conductivity behavior across different frequency ranges. This comprehensive analysis enhances the understanding of sodium silicate's electrical properties, which is crucial for potential applications in materials science, particularly in contexts where polarization effects and conductivity mechanisms play a key role. Beyond fundamental insights, the research offers practical implications for optimizing material performance in related fields.

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