通过Pb空隙和Trace Eu Doping来增强NA-Doped PbTe中的热电性能
Xuanwei Zhao1, Baoqin Fu1, Ran Ang1,2
1Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China.
ACS applied materials & interfaces
|December 12, 2024
概括
的空缺增加了电化物 (PbTe) 热电材料中的溶性. 这与欧兴奋剂相结合,显著提高了热电性能,达到2.3.3的峰值值 (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
- 计算材料科学科学 计算材料科学
背景情况:
- 由于低溶解度,提高添加电化 (PbTe) 的热电性能受到阻碍.
- 关于 (Pb) 空缺如何影响 (Na) 在PbTe中的溶解度的理论理解是有限的.
研究的目的:
- 调查Pb空缺对PbTe中的Na溶性的理论影响.
- 探索Pb空缺和痕迹欧洲 (Eu) 兴奋剂对PbTe.热电性质的综合影响.
主要方法:
- 使用晶体轨道汉密尔顿人群 (COHP) 分析.
- 使用的电子定位函数 (ELF) 分析.
- 研究了Pb0.95Na0.04Te.中微量欧盟兴奋剂的影响.
主要成果:
- Pb空隙增强了Te原子周围的Na-Te结合和电子定位,减少了Te空隙的形成并增加了Na的可溶性.
- 在Pb0.95Na0.04Te.中,Trace Eu doping优化了带的收.
- 在823 K时达到高峰热电功率 (zT) 值约2.3,从323 K到823 K时平均zT值约1.2.
结论:
- Pb空缺是提高PbTe中Na溶性和热电性能的一个关键策略.
- Pb空缺和微量欧元 doping 的协同效应导致了高性能热电材料的重大进步.
- 这些发现为开发下一代热电材料提供了理论见解.
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