多重填充的 skutterudites:通过单独优化电气和热传输的优化,具有高的热电功率
Xun Shi1, Jiong Yang, James R Salvador
1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
Journal of the American Chemical Society
|April 29, 2011
概括
使用多个填充剂 (Ba,La,Yb) 合成的 skutterudites 获得了高的热电功率 (ZT) 值1.7. 这种策略优化载体密度和声子散射,以提高热电性能.
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:
- 斯卡特鲁迪特 (CoSb3) 是一个有前途的热电材料.
- 优化它们的热电功率 (ZT) 对能源应用至关重要.
- 单个填充元件往往导致电气和热性能之间的权衡.
研究的目的:
- 通过Ba,La和Yb合成和表征多填充的斯库特鲁迪特 (CoSb3),使用Ba,La和Yb.
- 为了研究多个填充剂对热电性质的影响.
- 为了达到高的热电功率 (ZT).
主要方法:
- 合成纯相,多填充的 skutterudite 样本.
- 用X射线衍射 (XRD) 进行相位纯度分析.
- 高分辨率扫描传输电子显微镜 (STEM) 和能量分散式X射线光谱 (EDS) 用于结构和组成分析.
主要成果:
- 在850K时实现了1.7的高热电功率 (ZT) 值.
- 确认多个填充剂 (Ba,La,Yb) 在skuterudite纳米尺度内均分布.
- 证明多个填充剂可以显著降低玻璃极限附近的晶格导热率.
- 表明调整填充剂度可以优化载体密度,以满足高功率因子.
结论:
- 多重填充的 skutterudites 提供了一个独立优化电气和热传输特性的策略.
- 结合具有不同充电状态和声频率的填充器,可以提高ZT值.
- 这种方法可以扩展到其他中的热电化合物.
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