增强的加权移动性诱导了ArgyroditeAg8SnSe6的高热电性能
Siqi Lin1, Yuzhu Hou1, Ju Yang1
1College of Materials, Shanghai Dianji University, Shanghai 201306, China.
ACS applied materials & interfaces
|October 21, 2024
概括
区域化 (ZM) 合成通过改善离子扩散和减少电子散射来提高Ag8SnSe6中的热电性能,从而导致较高的zT值与热压 (HP) 相比. 这种方法对 argyrodite热电材料显示出希望.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 热电材料 热电材料
背景情况:
- 石家族,包括Ag8SnSe6,由于天然的低导热率和移动银离子,显示出热电应用的潜力.
- 这些材料的传统热压 (HP) 烧结方法可能会带来挑战,可能会限制它们的热电效率.
研究的目的:
- 研究区域化 (ZM) 方法作为高密度多晶体Ag8SnSe6的替代合成技术.
- 通过ZM与HP方法合成的Ag8SnSe6的热电特性进行比较.
主要方法:
- 合成Ag8SnSe6批量样本,使用区域化 (ZM) 和热压 (HP) 技术.
- 热电性质的全面评估,包括加权的移动性和导热性,在300K到700K的温度范围内.
主要成果:
- 与HP样本相比,ZM合成的样本在加权电子流动性上显著增加了~60%,这归因于电子散射的减少.
- 合成ZM的Ag8SnSe6在700K时达到1.05的峰值值值 (zT),比HP样本有所改善.
- ZM样本的平均zT值在评估温度范围 (300700 K) 中为0.71.
结论:
- 区域融 (ZM) 方法通过改善电荷载体传输,有效提高Ag8SnSe6的热电性能.
- ZM为生产高性能热电阿尔吉罗化合物提供了一条可行的途径,有可能适用于这个类别中的其他材料.
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