气候变化领域集成服务门户(CCPortal): 3D Printing of highly textured bulk thermoelectric materials: Mechanically robust BiSbTe alloys with superior performance

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DOI	10.1039/c9ee02044f
	3D Printing of highly textured bulk thermoelectric materials: Mechanically robust BiSbTe alloys with superior performance
	Qiu J.; Yan Y.; Luo T.; Tang K.; Yao L.; Zhang J.; Zhang M.; Su X.; Tan G.; Xie H.; Kanatzidis M.G.; Uher C.; Tang X.
发表日期	2019
ISSN	17545692
起始页码	3106
结束页码	3117
卷号	12 期号:10
英文摘要	While zone-melted (ZM) Bi2Te3 is a standard commercially available thermoelectric (TE) material, it suffers from not being sufficiently mechanically robust due to the presence of the van der Waals bonded Te-Te layers that reduce the product yield and compromise operational reliability. Polycrystalline materials prepared by powder metallurgy techniques exhibit improved mechanical properties but usually lose the desired texture exhibited by ZM ingots, and this affects their TE performance. It is highly desirable to be able to fabricate Bi2Te3-based bulk materials with anisotropies similar to a single crystal, yet being mechanically strong as the polycrystalline specimens. Herein, we combine for the first time the thermal explosion technique with selective laser melting (SLM) to synthesize the highly textured p-type Bi0.4Sb1.6Te3 bulk material. Structural analysis (FESEM and XRD) indicates that the slender columnar grains grew along the building direction (BD) of the structure and the orientation factor reached up to 0.9, close to that representing a single crystal. TEM images revealed a high density of dislocations inside the grains. Since the printed compound has a high degree of texture, the TE and mechanical properties exhibit a highly anisotropic behavior. The maximum ZT of annealed samples parallel to the BD was 1.1, similar to that of the single crystal. However, the compressive strength of the structure reached up to 91 MPa, some 2.5 times the strength of a typical single crystal (37 MPa), and even higher than that of Spark Plasma Sintered (SPS) polycrystalline samples (80 MPa). Meanwhile, the mechanical cutting performance was much superior compared to that of the ZM ingot, and TE legs could be cut to sizes as small as 0.2 mm. A micro-TE module assembled using SLM-printed high performance p-type BiSbTe and SPS-compacted n-type BiTeSe materials showed the maximum cooling temperature difference of 62 °C. The work provides a facile and effective solution for preparation of Bi2Te3-based materials with high texture, robust mechanical properties, and excellent TE performance. As such, it lays a solid foundation for rapid in situ 3D printing of Bi2Te3-based micro-TE devices. © 2019 The Royal Society of Chemistry.
英文关键词	Anisotropy; Bismuth compounds; Compressive strength; Crystal orientation; Cutting; Ingots; Materials handling equipment; Polycrystalline materials; Powder metallurgy; Selective laser melting; Selenium compounds; Single crystals; Textures; Thermoelectricity; Van der Waals forces; Density of dislocation; Operational reliability; Polycrystalline samples; Polycrystalline specimen; Powder metallurgy techniques; Selective laser melting (SLM); Thermo-Electric materials; Thermoelectric material; Bismuth alloys; compressive strength; detection method; mechanical property; metallurgy; performance assessment; temperature effect; three-dimensional modeling; transmission electron microscopy
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189803
作者单位	State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, Hubei, 430070, China; Department of Chemistry, University of Northwestern, Evanston, IL 60208, United States; Department of Physics, University of Michigan, Ann Arbor, MI 48109, United States
推荐引用方式 GB/T 7714	Qiu J.,Yan Y.,Luo T.,et al. 3D Printing of highly textured bulk thermoelectric materials: Mechanically robust BiSbTe alloys with superior performance[J],2019,12(10).
APA	Qiu J..,Yan Y..,Luo T..,Tang K..,Yao L..,...&Tang X..(2019).3D Printing of highly textured bulk thermoelectric materials: Mechanically robust BiSbTe alloys with superior performance.Energy & Environmental Science,12(10).
MLA	Qiu J.,et al."3D Printing of highly textured bulk thermoelectric materials: Mechanically robust BiSbTe alloys with superior performance".Energy & Environmental Science 12.10(2019).