在Ag2Te的室温可塑性是由Ag离子跳跃诱导的
Anan Guo1,2, Keke Liu1, Zhengzhou Wang1,2
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, China.
Nature communications
|February 5, 2026
概括
由于其可塑性,银素化物提供可曲的电子产品. 这项研究揭示了银化物 (Ag2Te) 中一种新的离子跳转介导域旋转机制,可以在保持晶体性的情况下实现显著的塑料应变.
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:
- 银焦化物具有很高的室温可塑性,对于灵活的电子和热电器件至关重要.
- 了解这种可塑性背后的原子尺度机制是材料设计的关键,因为像脱位滑动和无形化等途径因材料而异.
- 现有的知识差距阻碍了这些有前途的材料中可预测和可控制的塑料变形的发展.
研究的目的:
- 阐明银化物 (Ag2Te) 中明显的原子尺度变形机制.
- 研究离子运动和域旋转在适应塑料应变中的作用.
- 为了将观察到的变形机制与材料的热电特性相关联.
主要方法:
- 现场扫描/传输电子显微镜 (S/TEM) 用于直接观察原子规模的变形过程.
- 使用高分辨率成像和分析来追踪塑性变形期间的离子运动和晶格旋转.
- 热电性能是通过在室温下测量ZT值来进行的.
主要成果:
- 在Ag2Te.Te中发现了一种涉及压力驱动,离子跳转介导域旋转的新型变形机制.
- 观察到银离子跳跃到空位,以稳定子晶格,并促进协调晶格旋转 (~92.2°).
- 这种机制允许大量的塑料应变,同时保持长距离的结晶性,与脱位滑动和无形化不同.
结论:
- Ag2Te表现出一种独特的可塑性机制,与传统途径不同.
- 离子跳转介导的域旋转保持了晶体性,使Ag2Te适合灵活的电子.
- 由于室温ZT值为~0.67,Ag2Te是用于先进的灵活热电应用的有希望的材料.
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