南方科技大学知识苑(SUSTech KC): Hidden role of intrinsic Sb-rich nano-precipitates for high-performance Bi2-xSbxTe3 thermoelectric alloys

题名	Hidden role of intrinsic Sb-rich nano-precipitates for high-performance Bi2-xSbxTe3 thermoelectric alloys
作者	Fu, Liangwei 1,8; Lee, Kyu Hyoung 2; Kim, Sang-Il 3; Lim, Jae-Hong 4; Choi, Wooseon 1; Cheng, Yudong 5; Oh, Min-Wook 6; Kim, Young-Min 1,7; Kim, Sung Wng 1,7
通讯作者	Kim, Young-Min; Kim, Sung Wng
发表日期	2021-08-15
DOI	10.1016/j.actamat.2021.117058
发表期刊	ACTA MATERIALIA 影响因子和分区
ISSN	1359-6454
EISSN	1873-2453
卷号	215
摘要	Nanostructuring is a universal strategy to improve the figure of merit (zT) of thermoelectric (TE) materials by the substantial decrease of lattice thermal conductivity due to the intensive scattering of phonons at interfaces. However, nanostructured bismuth antimony telluride alloys with foreign nanosized phases usually suffer from the degradation of carrier mobility at incoherent interfaces. The results reported here describe an approach to generate intrinsic Sb-rich precipitates that have a synchronal effect on micrograined Bi0.5Sb1.5Te3 alloy. The designed formation of nanosized Sb-rich precipitates by dissolving excess Pb into Bi0.5Sb1.5Te3 matrix intensifies the phonon scattering and modulates the carrier transport simultaneously. By employing density functional theory calculation, transmission electron microscope and atom probe tomography, the role of Pb substituting for Sb site on the evolution of Sb-rich nanophase is clarified and the compositions and crystal structures of the precipitated Sb-rich phases are analyzed, revealing various interface structures. The optimized Bi0.5Sb1.5Te3 + 0.22 wt.% Pb sample shows a maximum zT value of 1.32 at 400 K with an outstanding average zT value of 1.2 over 300 K to 500 K. This work identifies the hidden role of intrinsic Sb-rich precipitates in Bi0.5Sb1.5Te3 alloys and provides an effective way beyond nanostructuring to develop high-performance bismuth antimony telluride thermoelectric alloys. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词	Bi0.5Sb1.5Te3 Thermoelectric Coherent interface Semi-coherent interface Sb-rich nano-precipitate
相关链接	[来源记录]
收录类别	SCI ; EI
语种	英语
学校署名	其他
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000684229400034
出版者	PERGAMON-ELSEVIER SCIENCE LTD
ESI学科分类	MATERIALS SCIENCE
来源库	Web of Science
引用统计	被引频次[WOS]：22
成果类型	期刊论文
条目标识符	http://sustech.caswiz.com/handle/2SGJ60CL/242950
专题	理学院_物理系
作者单位	1.Sungkyunkwan Univ, Dept Energy Sci, Suwon 16419, South Korea 2.Yonsei Univ, Dept Mat Sci & Engn, Seoul 03722, South Korea 3.Univ Seoul, Dept Mat Sci & Engn, Seoul 02504, South Korea 4.Gachon Univ, Dept Mat Sci & Engn, Seongnam 13120, South Korea 5.Rhein Westfal TH Aachen, Inst Phys IA, D-52056 Aachen, Germany 6.Hanbat Natl Univ, Dept Mat Sci & Engn, Daejeon 34158, South Korea 7.Inst Basic Sci, Ctr Integrated Nanostruct Phys, Suwon 16419, South Korea 8.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
第一作者单位	物理系
推荐引用方式 GB/T 7714	Fu, Liangwei,Lee, Kyu Hyoung,Kim, Sang-Il,et al. Hidden role of intrinsic Sb-rich nano-precipitates for high-performance Bi2-xSbxTe3 thermoelectric alloys[J]. ACTA MATERIALIA,2021,215.
APA	Fu, Liangwei.,Lee, Kyu Hyoung.,Kim, Sang-Il.,Lim, Jae-Hong.,Choi, Wooseon.,...&Kim, Sung Wng.(2021).Hidden role of intrinsic Sb-rich nano-precipitates for high-performance Bi2-xSbxTe3 thermoelectric alloys.ACTA MATERIALIA,215.
MLA	Fu, Liangwei,et al."Hidden role of intrinsic Sb-rich nano-precipitates for high-performance Bi2-xSbxTe3 thermoelectric alloys".ACTA MATERIALIA 215(2021).