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<p>In this study, Li<sub>3</sub>Fe<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> was synthesized successfully via a solid-state reaction, forming a pure single-phase monoclinic structure within the P2₁/c space group. The material’s relatively large grain size (~ 130&#xa0;μm) 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 μF at 473&#xa0;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 Li<sub>3</sub>Fe<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>’s potential for advanced applications in electrothermal devices and dielectric components, positioning it as a promising candidate for energy storage and electronic technologies.</p>

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Dielectric spectroscopy and electrothermal modeling of LISICON structures: understanding ion transport mechanisms

  • 期刊论文

  • 发表日期：

    2025年8月16日

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  • Samia Aydi,
  • Hanen Dardouri,
  • Sami Znaidia,
  • Benilde F. O. Costa,
  • Abderrazek Oueslati,
  • Abdelhedi Aydi

摘要

In this study, Li3Fe2(PO4)3 was synthesized successfully via a solid-state reaction, forming a pure single-phase monoclinic structure within the P2₁/c space group. The material’s relatively large grain size (~ 130 μm) 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 μF 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.