Synergetic Enhancement of Strength–Ductility and Thermoelectric Properties of Ag2Te by Domain Boundaries
Synergetic Enhancement of Strength–Ductility and Thermoelectric Properties of Ag2Te by Domain Boundaries
复制标题
域边界协同增强 Ag2Te 的强度-延展性和热电性能
DOI：
10.1002/adma.202302969
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发表时间：
2023
影响因子：
29.4
通讯作者：
Qingjie Zhang
中科院分区：
文献类型：
--
作者：
Hongtao Wang;Xiaotong Feng;Zhongtao Lu;Bo Duan;Houjiang Yang;Luoqi Wu;Ling Zhou;P. Zhai;G. J. Snyder;Guodong Li;Qingjie Zhang
同时提高机械和热电性能对无机热电材料的工程应用具有重要意义。在这项工作中，开发了一种新的纳米结构域策略，使Ag2Te化合物的抗压强度（160 MPa）和断裂应变（16%）比无结构域样品（分别为115 MPa和5.5%）提高了40%和200%。在平均ZT值上也提高了45%。畴边界（DBs）在抑制位错运动的同时为位错形核提供了额外的位置，从而获得了优异的强度和延展性。此外，DBs引起的声子散射抑制了Ag2Te的晶格热导率，也降低了Ag2Te的加权迁移率。这些发现为具有强大机械性能的高性能无机半导体的颗粒和DB工程提供了新的见解。
Simultaneously improving the mechanical and thermoelectric (TE) properties is significant for the engineering applications of inorganic TE materials. In this work, a novel nanodomain strategy is developed for Ag2Te compounds to yield 40% and 200% improved compressive strength (160 MPa) and fracture strain (16%) when compared to domain‐free samples (115 MPa and 5.5%, respectively). The domained samples also achieve a 45% improvement in average ZT value. The domain boundaries (DBs) provide extra sites for dislocation nucleation while pinning the dislocation movement, resulting in superior strength and ductility. In addition, phonon scattering induced by DBs suppresses the lattice thermal conductivity of Ag2Te and also reduces the weighted mobility. These findings provide new insights into grain and DB engineering for high‐performance inorganic semiconductors with robust mechanical properties.