微结构操纵实现了基于GeTe的热电模块的卓越效率
Qianqian Sun1,2, Kaiyi Chen1, Xiaojian Tan1,2
1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
Small (Weinheim an der Bergstrasse, Germany)
|February 21, 2025
概括
研究人员通过对其微观结构进行工程改进,增强了 Telluride (GeTe) 以实现稳定的发电. 这提高了热电性能和机械硬度,为高效的热电设备铺平了道路.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术纳米技术
背景情况:
- 化 (GeTe) 在高温下表现出有前途的热电特性.
- 然而,它的低对称结构和在室温附近的相位过渡限制了它的应用稳定性.
- 现有的GeTe材料在平衡热电效率与机械耐用性方面面临着挑战.
研究的目的:
- 改进GeTe的热电特性和机械硬度.
- 为了提高GeTe的服务稳定性,用于发电应用.
- 探索微结构操纵和相位过渡工程作为GeTe优化策略.
主要方法:
- 将Cr,Pb和Sb纳入GeTe网格以调节相位过渡.
- 微观结构的操纵,以改进结构和引入缺陷.
- 热电特性 (zT),机械硬度 (维克尔硬度) 和相位分数的表征.
主要成果:
- 在300K时,立方相分数从49%增加到73%.
- 在700 K达到2.1的高峰热电功率 (zT) 和1.5 (300-773 K) 的平均zT.
- 增强维克尔斯硬度至1.88 GPa,并证明了n型PbTe的9.7%的模块效率.
结论:
- 微结构操纵和相位过渡工程有效地提高了GeTe的热电性能和机械稳定性.
- 修改后的GeTe显示出高效的热电发电的巨大潜力.
- 这种方法为开发先进的热电材料提供了一个可行的策略.
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