Enhanced Thermoelectric Performance by Strong Phonon Scattering at the Heterogeneous Interfaces of the Mg2Sn/Mg3Sb2 High-Content Nanocomposite

被引：17

作者：

Zhu, Yongbin ^{[1
,2
]}

Han, Zhijia ^{[2
,3
]}

Han, Bing ^{[2
]}

Jiang, Feng ^{[2
]}

Wu, Xinzhi ^{[2
]}

Han, Cheng-Gong ^{[2
]}

Deng, Yonghong ^{[2
]}

Liu, Weishu ^{[2
,4
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

[2] Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

[3] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China

[4] Southern Univ Sci & Technol, Key Lab Energy Convers & Storage Technol, Minist Educ, Shenzhen 518055, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2021年 / 13卷 / 47期

关键词：

Mg2Sn/Mg3Sb2; high-content nanocomposites; heterogeneous interfaces; effective medium theory; high Kapitza resistance; lattice thermal conductivity; FIGURE-OF-MERIT; THERMAL-CONDUCTIVITY; COMPOSITES;

D O I：

10.1021/acsami.1c16299

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nano approaches are practical strategies to boost the thermoelectric figure of merit due to the strong phonon scattering from the grain boundaries and nanoinclusions. Here, we have reported a strong phonon scattering at the heterogeneous interfaces of Mg2Sn/Mg3Sb2 high-content nanocomposites (HCnCs). As a result, a significantly reduced lattice thermal conductivity of 1.09 W m(-1) K-1 was observed in the equimolar Mg2Sn/Mg3Sb2 HCnC, 80% lower than pure Mg2Sn and 25% lower than pure Mg3Sb2. As a result, a high ZT similar to 1.13 at 773 K was achieved in the Mg2Sn/Mg3Sb2 HCnC. Furthermore, various defects, including solid solutions, nanoinclusions, and misfit dislocations, were observed in both the Mg3Sb2 phase and the Mg2Sn phase through the microstructure characterization.

引用

页码：56164 / 56170

页数：7

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