高压合成具有增强热电性质的Te-Ge双替代斯库特鲁迪特
Yiping Jiang1, Xin Fan2, Qi Chen3,4
1College of Science, Beihua University, Jilin 132013, Jilin, China.
ACS applied materials & interfaces
|October 23, 2024
概括
高压合成的抗氧化 telluride germanides (Co4Sb11TexGe1−x) 显著降低了网格导热性. 这种优化带来了增强的热电性能,达到最大的zT值为1.13.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 热电学是一种热电学.
背景情况:
- 在热电应用中,Skutterudite材料具有前景.
- 优化热电传输特性对于高效的能量转换至关重要.
- 高压和元素替代是调整材料性能的策略.
研究的目的:
- 为了合成和描述新型的抗氧化 Telluride Germanide 化合物.
- 为了研究高压,高温合成对热电特性的影响.
- 在能源应用中评估Co4Sb11TexGe1−x的热电性能.
主要方法:
- 在高压 (∼2 GPa) 和高温 (∼900 K) 条件下合成Co4Sb11TexGe1−x (x = 0.5-0.8).
- 使用X射线衍射,扫描电子显微镜和电子反射散射衍射 (EBSD) 的微结构和形态表征.
- 测量电导率,西贝克系数和从300K到800K的热导率.
主要成果:
- 根据EBSD的分析,Co4Sb11Te0.8Ge0.2.2.的平均粒径为1μm.
- Co4Sb11Te0.8Ge0.2的晶格导热率被最小化为0.72 W m-1 K-1,比300 K减少了74%.
- 在800K时,Co4Sb11Te0.8Ge0.2获得了1.13的最大热电功率 (zT).
结论:
- 高压合成和多元替代 (Te和Ge) 有效地降低了 skutterudites 的晶格导热率.
- 增强的点和位置散射有助于减少热传输.
- 优化的热电传输特性证明了这些材料在废热回收方面的潜力.
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