制备工艺对塑性热电材料Ag2S0.4Te0.6结构与性能的影响

doi:10.15541/jim20260018

摘要/Abstract

摘要： Ag₂S_0.4Te_0.6作为一种具有良好塑性及热电性能的无机半导体材料,在可穿戴电子设备领域具有潜在的应用价值。近期研究表明,优化制备工艺(如退火处理)可显著提升其塑性,而该性能与材料的相结构密切相关。本研究收集了退火前后Ag₂S_0.4Te_0.6粉末样品在110 ~700 K温度范围内的高分辨率同步辐射粉末X射线衍射数据,结合Rietveld结构精修、高分辨透射电子显微镜以及原子对分布函数技术,详细分析了退火工艺对粉末样品的相组成与结构演变行为的影响。结果表明,退火前Ag₂S_0.4Te_0.6粉末样品主要为非晶态,仅含有少量结晶性很差的单斜相。在升温过程中,材料逐渐结晶首先出现单斜相,随后转变为体心立方(bcc)与面心立方(fcc)共存的混合相;降至室温后,样品依然保持以bcc相为主的立方结晶/非晶混合态。退火处理后,Ag₂S_0.4Te_0.6粉末样品在室温下即为立方结晶与少量非晶混合态,且在升温过程中未观察到明显的相变行为。此外,退火未对Ag₂S_0.4Te_0.6块体样品的热电性能产生明显影响。本研究为进一步理解退火改善Ag₂S_0.4Te_0.6材料的塑性提供了结构依据。

关键词: Ag₂S_0.4Te_0.6, 热电材料, 同步辐射, 结构演变, 退火

Abstract: Ag₂S_0.4Te_0.6 is an inorganic semiconductor with favorable ductility and thermoelectric performance, showing potential for applications in wearable electronics. Recent studies have indicated that optimization of preparation processes, such as annealing, can significantly enhance the ductility of the material, which is closely related to its phase composition and crystal structure. In this work, high-resolution synchrotron-radiation powder X-ray diffraction data of the Ag₂S_0.4Te_0.6 powder sample before and after annealing were collected over a temperature range of 110-700 K. By combining Rietveld structural refinement, high-resolution transmission electron microscopy, and atomic pair distribution function analysis, the influence of the annealing process on the phase composition and structural evolution behavior of the powder samples was investigated in detail. The results show that the pristine Ag₂S_0.4Te_0.6 powder is predominantly amorphous, containing only a small amount of poorly crystalline monoclinic phase. During heating, the material gradually crystallizes, first forming a monoclinic phase, which subsequently transforms into mixed body-centered cubic (bcc) and face-centered cubic (fcc) phases. After cooling back to room temperature, the sample remains in a mixed state of bcc-dominated cubic crystallinity and amorphous phase. In contrast, the annealed powder sample already exhibits a mixed cubic crystalline/amorphous state at room temperature, and no obvious phase transition behavior is observed during heating. Moreover, the thermoelectric properties of Ag₂S_0.4Te_0.6 bulk sample remain largely unaffected by the annealing process. This study provides structural insights for further understanding the annealing-induced improvement in ductility of Ag₂S_0.4Te_0.6 materials.

Key words: Ag₂S_0.4Te_0.6, thermoelectric material, synchrotron radiation, structural evolution, annealing

中图分类号:

TB34

刘今霄, 刘镇汉, 陈星宇, 周钲洋, 仇鹏飞, 张家伟, 史迅. 制备工艺对塑性热电材料Ag₂S_0.4Te_0.6结构与性能的影响[J]. 无机材料学报, DOI: 10.15541/jim20260018.

LIU Jinxiao, LIU Zhenhan, CHEN Xingyu, ZHOU Zhengyang, QIU Pengfei, ZHANG Jiawei, SHI Xun. Influence of Preparation Processes on the Structure and Properties of the Ductile Thermoelectric Material Ag₂S_0.4Te_0.6[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20260018.

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制备工艺对塑性热电材料Ag₂S_0.4Te_0.6结构与性能的影响

Influence of Preparation Processes on the Structure and Properties of the Ductile Thermoelectric Material Ag₂S_0.4Te_0.6

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