通过高压调制微结构,在n型Sb杂的Mg2Si0.3Sn0.7中实现高zT
Xiangyang Dong1,2, Ruying Zhai1,2, Bowen Zheng1,2
1Laboratory of High-Pressure Physics and Materials Science (HPPMS), School of Physics and Physical Engineering, Normal University, Qufu, Shandong 273165, China.
ACS applied materials & interfaces
|March 26, 2025
概括
这项研究使用高压,高温合成和火花等离子体烧结来增强Mg2(Si,Sn) 的热电材料. 优化的兴奋剂显著提高了功率 (zT) 的数字,达到1.37,提高了能量转换效率.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 能源转换 能源转换
背景情况:
- Mg2 ((Si,Sn) 化合物是有希望的,具有成本效益的热电材料.
- 现有的Mg2 ((Si,Sn) 固体溶液具有较低的优点 (zT),限制了它们的能量转换效率.
研究的目的:
- 为了提高Mg2 ((Si,Sn) 固体溶液的热电性能.
- 为了研究高压,高温 (HPHT) 合成和 (Sb) 兴奋剂对Mg2的作用 (Si0.3Sn0.7).
主要方法:
- 使用HPHT和火花等离子烧结 (SPS) 合成Mg2(Si0.3Sn0.7) 1-xSbx固体溶液 (x = 0-1.5%).使用HPHT和火花等离子烧结.
- 分析微观结构变化,载体度,电导率,西贝克系数和热导率.
主要成果:
- HPHT + SPS 方法改善了缺陷形成和载体度,提高了电导率.
- 压力诱导的带收和Sb兴奋剂增加了状态的有效质量密度 (md*) ~3.3me,提高了功率因子.
- 优化的Mg2(Si0.3Sn0.7) 0.99Sb0.01在673 K达到1.37的峰值zT,从323-723 K达到1.08的平均zT.
- 层次的声子散射抑制了晶格导热率至1.29 W m-1 K-1 在568 K.
结论:
- 通过控制缺陷和微观结构,HPHT合成和SPS有效地改善Mg2 (Si,Sn) 的热电特性.
- 抗兴奋剂和压力诱导的带效应显著提高了功率因子和功率的数字.
- 开发的方法为高性能Mg2 ((Si,Sn)) 基热电材料提供了一条途径.
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