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在谷物边界的热导性抑制的微观成像
Eleonora Isotta1, Shizhou Jiang2, Gregory Moller3
1Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA.
Advanced materials (Deerfield Beach, Fla.)
|June 13, 2023
概括
谷物边界工程影响材料的导热性. 微尺度成像显示,颗粒边界局部降低了SnTe中的导热率,与更好的热管理材料的误导角度相关.
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:
- 谷物边界工程是调整材料导热性的关键.
- 应用包括热电,热屏障涂层和热管理.
- 由于缺乏本地调查,对谷物边界的微量热流的理解是有限的.
研究的目的:
- 为了研究个体粒边界的局部导热率.
- 为了将谷物边界热阻与误导角度相关联.
- 为了进一步了解微观结构对热传输的影响.
主要方法:
- 利用空间分辨率频域热反射度用于热成像.
- 在单个粒度边界上进行微尺度分辨率测量.
- 采用了吉布斯过量方法来提取谷物边界热阻.
主要成果:
- 在热电SnTe.Te.中证明了单个粒边界的热成像.
- 揭示了在谷物边界的热导率的局部抑制.
- 发现的谷粒边界热阻与误导角度相关.
结论:
- 微尺度热成像提供了对谷物边界热传输的洞察.
- 了解热边界电阻对于设计先进的热管理和能量转换设备至关重要.
- 这项工作可以为高性能应用提供更好的材料设计.
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