学术报告 20
题目: [International Young Scholar Forum] Designing thermoelectric Mg3Sb2 and its analogues by combining theory and experiment
时间: 2020年09月20日 15:45
地点: Tencent Meeting
报告人: Dr. Jiawei Zhang

Aarhus University

Abstract: 

Thermoelectric materials enable the interconversion between heat and electricity with no moving parts, showing potential applications in waste heat harvesting and solid-state refrigeration. Systematically optimizing the thermoelectric performance of a material remains a great challenge due to the transport parameters being correlated with each other. Focusing on Mg3Sb2 and related CaAl2Si2-type materials, in this talk I will first present design strategies for electronic transport optimization including a simple atomic orbital scheme for p-type and multi-valley conduction bands for n-type, followed by a systematic exploration of potential n-type dopants with defect calculations. Afterwards, I will focus on the origin of intrinsically low lattice thermal conductivity of Mg3Sb2 from insights of phonon-phonon scattering. Finally, I will discuss the quantitative chemical bonding analysis and reveal the breakdown of the Zintl concept in Mg3Sb2 with a nearly isotropic three-dimensional chemical bonding network. This unique chemical bonding feature can be used to understand the nearly isotropic structural and thermal properties.

Brief CV of Dr. Jiawei Zhang: 

Dr. Jiawei Zhang received his PhD in 2018 from Aarhus University, after obtaining his Master’s degree in 2014 from Shanghai Institute of Ceramics, Chinese Academy of Sciences. Currently, he is a postdoctoral fellow at Aarhus University. His research focuses on understanding electrical and thermal transport properties for the design of new thermoelectric materials by combining comprehensive solid-state synthesis, structural and physical property characterizations, scattering techniques, chemical bonding analysis, and density functional theory calculations.

Contact: Shujuan Cui (崔书娟)

Email: sjcui@iphy.ac.cn

Tel: 82649894

系列报告采用腾讯会议室+网络直播的形式,相关信息将及时在网站http://iysf.iphy.ac.cn/更新,敬请关注!

Online Meeting Room ID (Tencent Meeting): 470 190 864

Password: 0920

Live link: https://meeting.tencent.com/l/FsoAuhofht6t

Please download and install the App in advance (the overseas version of Tencent Meeting is called VooV Meeting). You can enter the online meeting room by logging on the live link, or by entering the meeting ID and the password. Please use your real name for user name.