用Zn合的YbMg1.85-Zn的热电特性Bi1.98的热电特性
Simin Wei1, Nailing Qin1, Guiying Wu1
1School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China.
Materials (Basel, Switzerland)
|March 13, 2024
概括
在YbMg2Bi1.98 Zintl化合物中的替代增强了电导率并降低了热导率. 最佳的兴奋剂水平对于最大限度地提高这些有前途的材料的热电性能至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 无机化学 无机化学
背景情况:
- 基于Bi的Zintl化合物,特别是YbMg2Bi1.98,因其作为热电材料的潜力而得到认可.
- 对组合和兴奋剂的精确控制对于优化复杂半导体性能至关重要.
研究的目的:
- 研究 (Zn) 替代 (Mg) 对p型YbMg1.85-xZnxBi1.98.98的微观结构和热电特性的影响.
- 确定最佳的Zn兴奋剂度,以提高热电功率 (ZT).
主要方法:
- 使用诱导化合成了YbMg1.85-xZnxBi1.98的多晶样品.
- 用火花等离子烧结用于样品密集.
- 使用X射线衍射 (XRD) 和扫描电子显微镜与能量分散式X射线光谱 (SEM/EDS) 进行微结构和相位分析.
主要成果:
- 确定的主要阶段是三角形CaAl2Si2类型的晶体结构,存在小的二级阶段.
- 增加 Zn 兴奋剂导致电导率提高和格子导热率降低.
- 观察到Seebeck系数的显著降低和带间隙的减少与较高的Zn度,促进双极传导.
结论:
- 替代影响YbMg2Bi1.98的热电性质,在x = 0.1以下的最佳兴奋剂建议提高性能.
- 对于热电器件的应用,需要仔细考虑Zn兴奋剂引起的电,热和Seebeck特性之间的相互作用.
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