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Dielectric spectroscopy and electrothermal modeling of LISICON structures: understanding ion transport mechanisms
Authors: Aydi, S.; Dardouri, H.; Znaidia, S.; Costa, B.F.O.; Oueslati, A.; Aydi, A.
Ref.: Ionics Early Access (2025)
Abstract: In this study, Li3Fe2(PO4)(3) was synthesized successfully via a solid-state reaction, forming a pure single-phase monoclinic structure within the P2(1)/c space group. The material´s relatively large grain size (similar to 130 mu m) significantly influenced its dielectric and electrical characteristics. Comprehensive impedance and modulus spectroscopy analyses distinguished contributions from grains and grain boundaries, revealing non-Debye relaxation behavior. The dielectric measurements demonstrated a high dielectric constant combined with low dielectric losses, along with a substantial electrical capacitance of 4.6 mu F at 473 K, highlighting the material´s suitability for low-frequency energy storage applications. Additionally, the temperature-dependent power-law exponent indicated the simultaneous presence of correlated barrier hopping (CBH) and non-overlapping small polaron tunneling (NSPT) conduction mechanisms. These insights into charge transport and dielectric properties underscore Li3Fe2(PO4)(3)´s potential for advanced applications in electrothermal devices and dielectric components, positioning it as a promising candidate for energy storage and electronic technologies.
