一个可调节的结构家族具有超低的导热性:缺铜Cu1-□Pb1-Bi1+S3
Krishnendu Maji1, Pierric Lemoine2, Adèle Renaud2
1CRISMAT, CNRS, Normandie Univ, ENSICAEN, UNICAEN, 14000 Caen, France.
Journal of the American Chemical Society
|January 18, 2022
概括
研究人员合成了一种新型缺乏铜的硫化物CuPbBi5S9,具有超低的导热率 (κ). 这种无序的结构,与之前的发现不同,增强了声子散射,为高效的n型热电材料铺平了道路.
科学领域:
- 材料科学
- 固态化学
- 凝聚物质物理学
背景情况:
- 开发具有超低导热率 (κ) 的材料对于热电和热屏障应用至关重要.
- 了解热传输,晶体结构和秩序/混乱之间的关系是设计这些材料的关键.
- 高纯度的材料对于精确的热性能研究至关重要.
研究的目的:
- 合成和描述n型硫化物CuPbBi5S9.
- 研究其晶体结构并确定其超低导热率的来源.
- 探索其作为新型n型热电化合物的矩阵的潜力.
主要方法:
- 合成的CuPbBi5S9.
- 测量热导率 (κ) 在300-700K之间.
- 进行X射线衍射和结构分析以确定晶体结构.
- 网格动态计算以了解热传输机制.
- 化学替代 (S的Cl,Pb的Bi) 以优化热电性质.
主要成果:
- 合成的CuPbBi5S9具有0.4-0.6 W m-1 K-1的超低 κ.
- 这种材料形成了一个缺乏铜的无序工结构,而不是之前报告的有序格莱迪特.
- 超低的 κ 归因于涉及 Pb,Bi 和 Cu 的低能光学模式,通过无声效应增强了声子散射.
- 使用Cl和Bi显著提高了载体度和热电功率.
结论:
- 无序的金型CuPbBi5S9是具有超低导热性的n型热电材料的有希望的矩阵.
- 在这种结构原型中控制乱和优化兴奋剂可以设计高效的热电硫化物.
- 这项研究揭示了通过操纵晶体结构和缺陷来设计先进热电材料的新途径.
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