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协同带和接口工程通过双 Y/Ta 兴奋剂对高性能 n 型 Mg₃(Sb,Bi)₂热电学

Jie Zhang¹, Xiao-Lei Shi², Li Zhang¹

¹School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi'an, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|January 14, 2026

概括

(Y) 和 (Ta) 在抗氧化物 (Mg$_{3}$Sb$_{2}$) 基合金中的双重注显著提高了热电性能. 这一策略优化了电荷和声子传输,以实现高效的能量转换.

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:

富含二氧化碳的n型Mg_{3}${Sb,Bi) _{2}$合金由于成本和环境效益,对中低温热电材料具有前景.
在广泛的温度范围内实现高稳定的热电性能仍然是这些材料面临的重大挑战.

研究的目的:

通过使用双兴奋剂策略,协同优化n型Mg_{3}${Sb,Bi) _{2}$合金的电子带结构和接口特性.
研究 (Y) 和 (Ta) 兴奋剂对电荷和声子传输机制的联合作用.

主要方法:

在 Mg$_{3}$中使用 (Y) 和 (Ta) 的双策略.
研究了Y替代Mg$^{2+}$对费米水平和载体度的影响.
分析了金属Ta纳米包裹的形成及其对界面特性和声子散射的影响.

主要成果:

Y兴奋剂调整了费米水平并增加了载体度,同时保持了电导率.
纳米包含有效地减少了接口障碍,并通过多尺度接口增强了声子散射.
双兴奋剂方法在479-531 K之间实现了ZT>1.2的峰值,在300-600 K之间达到1.05的平均ZT.
一个单脚装置显示预测的转换效率为14.58%.

结论:

合作的Y和Ta兴奋剂策略有效地优化了电荷和声子传输,优于单元兴奋剂.
这种方法为开发可持续的,高性能的n型热电材料提供了新的途径.
优化的Mg3Sb,Bi2合金显示了实际热电应用的巨大潜力.

关键词:

Mg3{\displaystyle Sb,Bi) }2 在中.乐队工程乐队工程是指乐队的工程.兴奋剂的使用兴奋剂的使用接口接口接口接口接口热电热电的电力.

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