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<p>In this study, we synthesized Na<sub>3</sub>SbS<sub>4</sub> and characterized it using powder X-ray diffraction (XRD) and alternating-current electrochemical impedance spectroscopy. Temperature-dependent XRD was employed to examine the phase change of the synthesized compound. Rietveld data refinement revealed that the crystalline size of Na<sub>3</sub>SbS<sub>4</sub> varied as the sample was heated from room temperature to 200&#xa0;°C and cooled to room temperature. The structural analysis revealed that Na<sub>3</sub>SbS<sub>4</sub> had its structure transformation started at about 110 ~ 120&#xa0;°C and the crystal structure at higher temperature was partly preserved at room temperature after the heating-cooling processes. The temperature dependence of the conductivity was evaluated by electrochemical impedance spectroscopy. The data were extracted to obtain the DC conductivity and to understand the conduction mechanism. The prepared Na<sub>3</sub>SbS<sub>4</sub> exhibited excellent ionic conductivity of 1.17 × 10<sup>−3</sup> S cm<sup>−1</sup> at 25&#xa0;°C. Further analysis revealed that the conduction mechanism in the sample can be described by a nonoverlapping small-polaron tunneling model.</p>

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Investigation of Na+ transport in a Na3SbS4 superionic conductor via Alternating-Current electrochemical impedance spectroscopy

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Tran Anh Tu,
  • Nguyen Huu Huy Phuc

摘要

In this study, we synthesized Na3SbS4 and characterized it using powder X-ray diffraction (XRD) and alternating-current electrochemical impedance spectroscopy. Temperature-dependent XRD was employed to examine the phase change of the synthesized compound. Rietveld data refinement revealed that the crystalline size of Na3SbS4 varied as the sample was heated from room temperature to 200 °C and cooled to room temperature. The structural analysis revealed that Na3SbS4 had its structure transformation started at about 110 ~ 120 °C and the crystal structure at higher temperature was partly preserved at room temperature after the heating-cooling processes. The temperature dependence of the conductivity was evaluated by electrochemical impedance spectroscopy. The data were extracted to obtain the DC conductivity and to understand the conduction mechanism. The prepared Na3SbS4 exhibited excellent ionic conductivity of 1.17 × 10−3 S cm−1 at 25 °C. Further analysis revealed that the conduction mechanism in the sample can be described by a nonoverlapping small-polaron tunneling model.