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

IF 2.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Electroceramics Pub Date : 2025-09-29 DOI:10.1007/s10832-025-00427-8

Tran Anh Tu, Nguyen Huu Huy Phuc

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Abstract

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.

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交流电化学阻抗谱法研究Na3SbS4超离子导体中Na+输运

在本研究中，我们合成了Na3SbS4，并利用粉末x射线衍射（XRD）和交流电化学阻抗谱对其进行了表征。采用x射线衍射（XRD）对合成化合物的相变进行了表征。Rietveld数据细化表明，当样品从室温加热到200℃，冷却到室温时，Na3SbS4的晶体尺寸会发生变化。结构分析表明，Na3SbS4在110 ~ 120℃左右开始发生结构转变，高温下的晶体结构在室温下经过加热-冷却过程部分保留。利用电化学阻抗谱分析了电导率的温度依赖性。提取数据得到直流电导率，了解导电机理。制备的Na3SbS4在25℃时离子电导率为1.17 × 10−3 S cm−1。进一步分析表明，样品中的传导机制可以用非重叠的小极化子隧穿模型来描述。

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来源期刊

Journal of Electroceramics 工程技术-材料科学：硅酸盐

CiteScore

2.80

自引率

5.90%

发文量

审稿时长

5.7 months

期刊介绍： While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including: -insulating to metallic and fast ion conductivity -piezo-, ferro-, and pyro-electricity -electro- and nonlinear optical properties -feromagnetism. When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice. The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.