在CrSb2中通过Fe-Bi共同替代降低了导热性和增强了TE性能
Sahiba Bano1, Shamim Sk1, Takashi Aizawa1
1Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba 305-0044, Japan.
Nanotechnology
|July 29, 2024
概括
在CrSb2中使用铁 (Fe) 和 (Bi) 的重元素共同替代有效降低了导热率. 这一策略显著提高了热电材料中的热电功率 (ZT).
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 (TE) 技术的效率取决于TE材料的性能.
- 重元素的替代增强了声子散射,这对于改善TE特性至关重要.
- 优化高TE值 (ZT) 的兴奋剂仍然是一个挑战.
研究的目的:
- 研究CrSb2中联合Fe和Bi共同替代的疗效,以增强ZT.
- 通过有针对性的剂策略来降低导热率.
- 为设计其他 TE 材料中有效的剂提供洞察力.
主要方法:
- 通过炉反应和火花等离子体烧结,合成了共同替代的Cr1-xFexBiySb2-y样本.
- 进行了相位分析并研究了取决于温度的TE传输特性.
- 利用投影机增强波方法进行电子结构计算,以分析障碍效应.
主要成果:
- 在300K时实现了Cr0.75Fe0.25Bi0.15Sb1.85的导热率显著降低至~2.5W m-1K-1,是原始CrSb2.85的一半.
- 观察到ZT的90%的增强,在350K时达到0.021~,Cr0.75Fe0.25Bi0.15Sb1.85.8的增强.
- 归因于质量波动,点缺陷和Bi在粒边界的热导率降低.
结论:
- 联合Fe和Bi的共同替代是一种增强CrSb2.2中ZT的有希望的策略.
- 由共同替换引起的障碍有效降低了导热率.
- 这些发现为热电材料中剂的合理设计提供了宝贵的指导.
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