电热磁效应诱导的高热电性能的化纳米复合材料的化纳米复合材料
Zongmo Shi1, Zhen Han1, Wei Huang2
1College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, P. R. China.
ACS applied materials & interfaces
|August 12, 2024
概括
在Ca3Co4O9中引入BaFe12O19纳米圈显著提高了热电性能. 这种由电热磁效应驱动的增强,在1073K时达到0.51的高ZT值.
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:
- 基于氧化和 (Ca3Co4O9) 的材料是有前途的热电氧化物.
- 它们的实际应用受阻于电阻和导热之间的固有权衡.
研究的目的:
- 通过引入BaFe12O19纳米球来提高Ca3Co4O9的热电性能.
- 调查潜在的机制,包括电热磁效应,负责提高性能.
主要方法:
- 合成含有BaFe12O19纳米球的Ca3Co4O9矩阵复合材料.
- 由此产生的纳米复合材料的表征,包括相位分析和微观结构观测.
- 在高温下测量热电特性 (Seebeck系数,电电阻,热导率).
主要成果:
- 成功结合了BaFe12O19纳米球,导致纳米级沉和金属Ag,费里特和矩阵相的共存.
- 由于电热磁效应的带曲和接口电位形成的观察,促进孔迁移.
- 在1073 K的温度下,达到0.51的高峰热电功率 (ZT) 为8重%BaFe12O19/Ca3Co4O9纳米复合材料.
- 记录了较低的电阻 (6.7 mΩ·cm),高的西贝克系数 (217.5 μV/K) 和显著降低的导热率 (1.11 W/(m·K)).
结论:
- 引入BaFe12O19纳米球有效地提高了Ca3Co4O9.9的热电性能.
- 电热磁效应在改善孔迁移和整体热电效率方面发挥着至关重要的作用.
- 纳米级铁磁相散射声子是导致导热率显著降低的原因.
- 这项研究表明了一种可行的策略,以克服氧化物热电材料的性能限制.
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