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波段工程和音频工程有效地改善n型Mg₃Sb₂热电材料性能

Lu Yu¹, Si-Tong Wei¹, Li-Jun Wang²

¹College of New Energy and Materials, China University of Petroleum, Beijing 102249, PR China.

ACS applied materials & interfaces

|November 10, 2023

概括

这项研究通过配合 (Tb) 和 (Er) 来增强基于Mg3Sb2的热电材料. 这种方法提高了电性能,降低了导热率,达到1.71的峰值ZT值,有效地将热转化为电.

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:

基于Mg3Sb2的材料对热电应用有前途,将热量转化为电力.
提高电性能和降低导热率是关键的挑战.
津特尔相为先进的热电材料提供了一条途径.

研究的目的:

设计和研究一种基于Mg3.2Sb1.5Bi0.5.5的新型热电Zintl相.
通过配合 (Tb) 和 (Er) 来增强热电性能.
评估 codoping 对电气性能,热导率和机械稳定性的影响.

主要方法:

用于材料设计的统一原则计算.
合成的Mg3.2Sb1.5Bi0.5被添加了Tb和Er.
进行了热电特性 (ZT值,功率因子) 的实验性表征.
测量机械性能,包括扬模和维克尔硬度.

主要成果:

与Tb和Er的配合有效地改善了电气性能,并降低了晶格导热率.
采用Mg3.185Tb0.01Er0.005Sb1.5Bi0.5的样本获得了最大的ZT值为1.71.
该材料具有良好的机械性能 (模:51.85 GPa,维克尔硬度:0.99 GPa).
在12个热周期 (323-723 K) 中,表现出稳定的性能,功率因子误差低 (1.8%-2.1%) .

结论:

用Tb和Er对基于Mg3Sb2的Zintl相进行合是提高热电性能的有效策略.
由于其高ZT值和稳定性,设计的材料显示了实际热电器件应用的巨大潜力.
这项研究有助于开发高效和环保的热电材料.

关键词:

在Mg3.2Sb1.5Bi0.5中.骑自行车的稳定性骑自行车的稳定性兴奋剂的使用兴奋剂的使用第一个原则是计算.机械参数机械参数热电热电的电力.

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