铜缺陷增强稳定性的微机制:一个几乎在现场的TEM研究电诱导的结构进化在Cu2-S,Se) 液态热电材料
Xiaoyue Lu1,2, Ping Lu1, Yuyu Wei1
1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
Nano letters
|February 26, 2024
概括
在铜硫化热电材料中引入铜空缺,提高了它们在电场下的稳定性. 这项研究揭示了空缺如何促进更稳定的中间阶段,防止元素退化.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 纳米技术纳米技术
背景情况:
- 基于铜的液态热电材料具有出色的导热性,但在操作压力下稳定性不佳.
- 众所周知,铜空缺可以提高化学稳定性,但根本的机制尚未完全理解.
研究的目的:
- 调查铜硫化热电材料中增强稳定性的微机制,其中有电场下的铜空缺.
- 为了比较Cu2-xS0.2Se0.8 (x = 0, 0.05) 在外部电场下的结构演变,使用准*in situ*传输电子显微镜.
主要方法:
- 采用近在位传输电子显微镜 (TEM) 技术观察结构变化.
- 将外部电场应用于 Cu2-xS0.2Se0.8 样本,其中铜空位度各不相同 (x = 0 和 0.05).
- 分析中间阶段的形成和原子的排序.
主要成果:
- 预设的铜空缺使电感应的稳定六角形CuSe型中间相的形成更加容易.
- 这个中间阶段表现为叶片缺陷或,不太常见,作为长距离的有序结构.
- 硫 (S) 和 (Se) 原子的排序发生在矩阵内.
- 铜和原子被有效地稳定,减轻了元素沉积和蒸发.
结论:
- 铜空缺对于提高基于Cu的热电材料在电场下的稳定性至关重要.
- 形成一个稳定的六角形CuSe型中间相是防止材料降解的关键机制.
- 这项研究提供了通过控制空位度来设计更强大的热电设备的见解.
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