Spectroscopic approach to understanding complex impedance in sodium silicate

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. 1. Complex Impedance Spectroscopy (CIS) of Sodium Silicate (Na₂SiO₃): The study investigates the electrical properties of sodium silicate across varying frequencies and temperatures, with a focus on grain and grain boundary polarization effects. 2. Non-Debye Relaxation Behavior: The research identifies a deviation from ideal relaxation models, indicating a non-Debye relaxation behavior in sodium silicate, which is crucial for understanding its electrical response. 3. Polaron-Controlled Hopping Mechanism: Both dielectric relaxation and dispersion contribute to a polaron-controlled hopping mechanism, influencing the conductivity of the material. 4. Nyquist Plot Analysis: The presence of a single semi-circular arc in the Nyquist plot points to grain boundary polarization as the dominant process impacting impedance. 5. Correlated Barrier-Hopping Model: The study applies this model to explain the AC conductivity behavior over different frequency ranges, offering insights into conduction mechanisms. 6. XRD and FESEM Analysis: Structural characterization confirms the orthorhombic crystal structure of sodium silicate, with a well-defined crystalline material suitable for electrical investigations. 7. Temperature-Dependent Conductivity: The study finds that conductivity increases with temperature, following a hopping conduction mechanism, supported by grain boundary effects. 8. Implications for Electro-Ceramic Applications: The research provides valuable knowledge for optimizing materials in applications where understanding polarization and conductivity mechanisms is critical, advancing both fundamental and applied materials science. These findings contribute to a deeper understanding of sodium silicate's electrical behavior, paving the way for future research and technological applications in electro-cerami