同时具有高热电和磁热性能的BiSbTe/NiMnIn复合材料,用于全固态热电磁制冷
Peilin Miao1,2, Lei Sheng3, Longli Wang1,2
1Hubei Longzhong Laboratory, Wuhan University of Technology, Xiangyang Demonstration Zone, Xiangyang 441000, China.
ACS applied materials & interfaces
|January 21, 2025
概括
一种新的复合材料结合了高温电和 - - - - 的磁热成分,用于先进的混合制冷. 这种双重功能材料在室温附近实现了高热电和磁热性能.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 热力学是一种热力学.
背景情况:
- 全固态混合制冷需要在室温附近具有高热电 (TE) 和磁热 (MC) 性能的材料.
- 在单相化合物中实现高TE和MC性能是具有挑战性的.
- 复合材料为结合不同的功能提供了一个潜在的解决方案.
研究的目的:
- 开发一种具有双 TE 和 MC 功能的创新热电磁复合材料.
- 研究热电和磁热成分之间的扩散机制.
- 为高效的混合制冷应用优化复合材料.
主要方法:
- 使用Bi-Sb-Te (热电) 和Ni-Mn-In (磁热) 组件制造复合材料.
- 使用电子探针微分析仪 (EPMA) 来研究扩散的实验分析.
- 使用密度函数理论 (DFT) 来理解扩散机制的理论计算.
- 烧结参数的优化,以控制相互扩散.
主要成果:
- 一种复合材料,Bi0.4Sb1.6Te3/15 wt % Ni50Mn35In15,已经成功合成.
- 通过合理化烧结参数,可以显著减轻组件之间的互扩散.
- 复合材料获得了高的热电功率 (ZT = 0.66).
- 观察到一个很大的磁变化 (ΔSmax = 3.08 J kg-1 K-1 在5 T).
- 在300K左右,高TE和MC性能均被证明.
结论:
- 热电磁复合材料可以有效地结合高热电和磁热性能.
- 控制间扩散对于优化这种复合材料的性能至关重要.
- 这种复合材料对开发全固态TE/MC混合冷却系统具有显著的前景.
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