在超重力下加工的经典BiSbTe合金中获得的超高热电性
Min Zhou1, Haojian Su2,3, Jun Pei4
1State Key Laboratory of Cryogenic Science and Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China. mzhou@mail.ipc.ac.cn.
Nature communications
|August 16, 2025
概括
一种新的超重力制造方法增强了热电材料,如木 telluride. 这种技术优化了微观结构和载体度,实现了发电和冷却应用的创纪录性能.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 能源转换 能源转换
背景情况:
- 热电材料将热转化为电力,使发电和固态制冷成为可能.
- 由于电气和热传输特性之间的复杂相互作用,提高热电性能受到阻碍.
- 优化热电材料需要创新的制造技术来克服固有的材料限制.
研究的目的:
- 为了引入一种新的超重力场再化制造技术.
- 为了协同优化 (Bi,Sb) 2Te3合金的热电性能.
- 展示一种用于增强热电材料的新策略,适用于其他系统.
主要方法:
- 在 (Bi,Sb) 2Te3合金的重新化过程中使用超重力场.
- 通过超重力诱导不寻常的塑料变形和微观结构缺陷.
- 分析微结构重建和载体度优化.
主要成果:
- 实现了超低的网格导热率 (<0.25 W/m K).
- 在BiSbTe合金中获得了创纪录的优点 (>1.91) 值.
- 在185K的温度差异下,展示了一种具有6.4%的转换效率和0.34W/cm2输出功率密度的热电模块.
结论:
- 超重力制造方法通过优化微观结构和载体度,显著提高了热电特性.
- 这种新的方法为推进热电材料以实现高效的能量转换提供了一个有前途的战略.
- 展示的技术在各种热电材料和设备中具有潜在的应用.
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