Thermoelectric transport enhancement of Te-rich bismuth antimony telluride(Bi_(0.5)Sb_(1.5)Te_(3+x))through controlled porosity
作者机构：Department of Materials Science and EngineeringNorthwestern University2220 Campus DriveCook Hall 2036EvanstonIL60208USA
出 版 物：《Journal of Materiomics》 (无机材料学学报（英文）)
年 卷 期：2020年第6卷第3期
页 面：532-544页
核心收录：
学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学]
基 金：supported by the U.S.Department of Energy,Office of Science and Office of Basic Energy Sciences under award number DE-SC0014520 the EPIC facility of Northwestern University’s NUANCE Center,support from the Soft and Hybrid Nanotechnology Experimental(SHyNE)Resource(NSF ECCS-1542205) the MRSEC Program(NSF DMR-1720139)at the Materials Research Center the International Institute for Nanotechnology(IIN) the Keck Foundation the State of Illinois,through the IIN the MatCI Facility which receives support from the MRSEC Program(NSF DMR-1720139)of the Materials Research Center at Northwestern University supported by the National Science Foundation Graduate Research Fellowship under Grant No.DGE-1324585
主 题：Bismuth antimony telluride Thermoelectric Porosity Transport modeling Foaming
摘 要：Alloys of Bi_(2)Te_(3) and Sb_(2)Te_(3) are the best performing p-type thermoelectrics near room temperature and have been the subject of extensive engineering *** improvement is achieved by introducing defects that effectively scatter phonons and reduce thermal ***,outstanding results are often difficult to reproduce as the process variables involved are difficult to control or possibly ***,a reproducible and controllable method of fabricating porous Bi_(0.5)Sb_(1.5)Te_(3+x) is *** effective medium theory(EMT)predicts no benefit,improvements in the thermoelectric quality factor,B(which determines the maximum zT of a materials),were as high as 45% parallel to the pressing direction for a sample of roughly 20% *** study of microstructural evolution with increasing porosity is facilitated by a combination of Scanning/Transmission Electron Microscopy(S/TEM)and Electron Backscattered Diffraction(EBSD).This study reveals a statistically significant shift in the distribution of grain boundaries favoring lower energy twins,which coincides with an increase in the presence of stepped twin *** work demonstrates the potential benefits of careful grain boundary engineering and the need for further detailed studies of the dependence of thermal and electrical transport on grain boundary structure and orientation in these alloys.
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