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<p>This study examines the structural, optical, and electrical properties of NaBa(PO<sub>3</sub>)<sub>3</sub> to evaluate its potential in solid-state ionic devices. Phase-pure NaBa(PO<sub>3</sub>)<sub>3</sub> was synthesized by a high-temperature solid-state reaction and characterized using XRD, FTIR, UV–Vis, and AC impedance spectroscopy. Rietveld refinement confirmed the formation of an orthorhombic P2<sub>1</sub>2<sub>1</sub>2<sub>1</sub> structure. The material exhibits a wide optical band gap and thermally activated Na<sup>+</sup> conduction consistent with polaron hopping, highlighting its potential for high-temperature ionic and dielectric applications. Impedance and modulus analyses reveal non-Debye relaxation and distinct grain and grain-boundary contributions. Its negative temperature coefficient of resistivity and high sensitivity index highlight strong potential for high-temperature thermistor and solid-state electrolyte applications.</p>

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Thermally activated sodium-ion transport and optical properties of NaBa(PO3)3 for high-temperature electronics and energy storage applications

  • 期刊论文

  • 发表日期：

    2026年4月24日

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  • M. Karray,
  • Mohamed Mounir Bouzayani,
  • S. Nasri,
  • H. Marzougi,
  • E. A. Elghmaz,
  • M. B. Ghzaiel,
  • A. Oueslati

摘要

This study examines the structural, optical, and electrical properties of NaBa(PO3)3 to evaluate its potential in solid-state ionic devices. Phase-pure NaBa(PO3)3 was synthesized by a high-temperature solid-state reaction and characterized using XRD, FTIR, UV–Vis, and AC impedance spectroscopy. Rietveld refinement confirmed the formation of an orthorhombic P212121 structure. The material exhibits a wide optical band gap and thermally activated Na+ conduction consistent with polaron hopping, highlighting its potential for high-temperature ionic and dielectric applications. Impedance and modulus analyses reveal non-Debye relaxation and distinct grain and grain-boundary contributions. Its negative temperature coefficient of resistivity and high sensitivity index highlight strong potential for high-temperature thermistor and solid-state electrolyte applications.