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原子离心和谷物边界工程驱动AgSbSe中的非凡热电性质
Hongda Song1, Saichao Cao2, Wen Zhang1
1Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China.
Small (Weinheim an der Bergstrasse, Germany)
|September 4, 2025
概括
研究人员通过结合原子离心和谷物边界工程来增强银二氧化 (AgSbSe2) 的热电特性. 这种新的方法显著提高了电导率和降低了热导率,提高了材料的热电性能.
科学领域:
- 材料科学
- 固态物理
- 纳米技术
背景情况:
- 银化物 (AgSbSe2) 是一种具有较低导热率和较高西贝克系数的有前途的p型热电材料.
- 低电导率阻碍了AgSbSe2的整体热电性能.
- 为了推进基于AgSbSe2的热电,制定提高电传输性能的策略至关重要.
研究的目的:
- 通过一种新的方法增强AgSbSe2的热电性质.
- 为了研究原子离心和谷物边界工程的联合效应.
- 优化双化AgSbSe2中的Ag/Sb比,以提高热电性能.
主要方法:
- 在Ag1+ySb1−x−yBixSe2中对Ag/Sb比率进行双和精确调整.
- 同时促进谷物生长和放大原子偏中心行为.
- 结构,电气和热传输性能的表征.
主要成果:
- 实现了增强的室温载体流动性,从2.49cm2V-1s-1增加到11.16cm2V-1s-1在Ag1.01Sb0.9Bi0.09Se2.
- 在Ag1.01Sb0.9Bi0.09Se2中获得了≈7.2μW cm-1 K-2的高功率系数.
- 在673K下降到≈0.37W m-1 K-1,与原始的AgSbSe2相比,降低了20%,导致功率 (zT) 在673K下降到≈1.11.
结论:
- 阴离子调节的协同优化有效地促进了谷物生长,并放大了离心行为.
- 这一战略为设计高性能AgSbSe2热电材料提供了新的范例.
- 增强的Ag1.01Sb0.9Bi0.09Se2显示了热电应用的巨大潜力.
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