Comprehensive Analysis of Impedance Spectroscopy and Conductivity Evaluation of Ionic Transport in Lithium Borate Glasses

This paper presents a comprehensive investigation of the electrical properties of ionic conductors, with a particular focus on lithium borate glasses, using impedance spectroscopy. We explore the complex behavior of these materials across a wide frequency range, examining both bulk samples and thin films to elucidate the fundamental mechanisms of ionic conduction and interfacial phenomena. To address the limitations of conventional equivalent circuit models, we use the Constant Phase Element (CPE) as a more accurate alternative to simple RC (resistor-capacitor) circuits for describing non-ideal behavior in real systems. We provide a thorough derivation and validation of a new relationship between CPE parameters and conventional capacitance values, offering improved tools for interpreting impedance data. The paper also addresses practical challenges in impedance spectroscopy measurements, including frequency range limitations and their impact on data interpretation. We propose methods for overcoming these challenges and extracting meaningful information from partial impedance spectra. Furthermore, we explore the physical origins of the observed non-ideal behavior, discussing various models, such as the jump relaxation model, and relating them to the microstructure and composition of the ionic conductors. This work provides crucial insights into ion transport mechanisms in glassy electrolytes, offers practical guidelines for analyzing impedance spectroscopy data, and has significant implications for the development of ionic conductors in applications such as solid-state batteries and sensors. This work lays the foundation for future research on a broader range of compositions and structures, as well as the development of more sophisticated models for ionic conducting systems.

کلیدواژه ها:

Ion conductivity ، Impedance spectroscopy ، Impedance semicircle ، constant phase element