SEMINAR
The State Key Lab of
|High Performance Ceramics and Superfine Microstructure

　　Shanghai Institute of Ceramics, Chinese Academy of Sciences

　　中 国 科 学 院 上 海 硅 酸 盐 研 究 所 高 性 能 陶 瓷 和 超 微 结 构 国 家 重 点 实 验 室

　　Engineering the phonon transport in half-Heusler materials through a bottom-up nanostructure synthesis approach

　　赵怀周

　　中国科学院物理研究所　　

　　时间：2016年9月27日（星期二）下午2: 00

　　地点： 2号楼607会议室（国家重点实验室）

　　欢迎广大科研人员和研究生参与讨论！

　　联系人：史 迅（2803）

　　Abstract

　　Half-Heusler (HH) alloys Zr(Ti, Hf)NiSn, Zr(Ti, Hf)CoSb, and Nb(V)FeSb are among the best thermoelectric (TE) materials promisingly applicable for the middle-to-high temperature power generations. Despite of the large thermoelectric power factor and decent figure-of-merit ZT (~1) of these materials, their broad applications and further enhancement on TE performance is limited by the high intrinsic lattice thermal conductivity (κL) due to insufficiencies of phonon scattering mechanisms in above three systems, and the fewer powerful strategies associated with the micro-structural engineering for HH materials. We report a bottom-up nanostructured synthesis for above HH materials through displacement reaction between metal chlorides and lithium, followed by vacuum-assisted spark plasma sintering process. The new HH samples are featured with intense dislocation arrays at the grain boundaries, leading to significantly lower κL and enhanced thermoelectric performance. This strategy can be extended to many other notable TE materials and a broad range of advanced alloys and compounds. 4) Toughening fibre reinforced plastic composites using nano rubber.

　　Brief Introduction

　　Dr. Huaizhou Zhao received his M.S in Chemistry from Beijing Normal University in 2003, then his PhD in Condensed Matter physics from Institute of Physics at Chinese Academy of Sciences (IOP, CAS) in 2006, followed by the postdoctoral research with Prof. Zhifeng Ren at Boston College and University of Houston. He moved back to the IOP, CAS at the end of 2013 to start his independent research as an Associate Professor under the sponsor of “One-Hundred Talents program, level II ” at IOP.

　　Dr. Zhao has extensive experience in the growth and device fabrications of low-dimensional nanomaterials and thermoelectric. He has published or co-authored more than 30 research papers in JACS, ACS Nano, Nature Nanotechnology, Angew Chem Int. Edt, etc. His innovative work in the low temperature and near room temperature thermoelectric systems, particularly in FeSb2 and MgAgSb materials have led to publications in Nano Energy, Energy Environ. Sci. and Adv. Funct. Mater in recent years. His work at the IOP is funded by IOPCAS, NSFC and CAS programs.