一种超稳定的薄膜海斯勒合金的热电性能
B Hinterleitner1,2, I Knapp1,2, M Poneder1,2
1Institute of Solid State Physics, Technische Universität Wien, Vienna, Austria.
Nature
|November 15, 2019
概括
研究人员为高效的热电装置开发了新的海斯勒合金. 这些材料具有很高的优点,对于将热量转化为电力至关重要,为先进的热电发电机铺平了道路.
科学领域:
- 材料科学
- 固态物理
- 凝聚物质物理学
背景情况:
- 热电材料将热梯度转化为电能.
- 效率取决于西贝克系数,电阻率和热导率 (优点图).
- 对于热电发电机应用来说,高功率是必不可少的.
研究的目的:
- 研究薄膜海斯勒合金的热和电子性能.
- 评估它们的热电应用潜力.
主要方法:
- 使用磁喷射制成的薄膜海斯勒合金 (Fe2V0.8W0.2Al).
- 密度函数理论 (DFT) 的计算.
- 测量功率系数 (Seebeck系数的平方除以电阻).
主要成果:
- 薄膜通过DFT被识别为转移稳定的状态.
- 测量表明这些薄膜具有很高的内在价值.
- 高功率因子表明了高效的热电能转化潜力.
结论:
- 研究的海斯勒合金显示出热电应用的前景.
- 大差态密度和韦尔式电子分散有助于高电荷载体的移动性.
- 这些特性表明热电发电机具有很高的潜力.
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