报告人：帅晶
时间： 5月25日（周四）14:00
单位：中科院物理所
地点：M楼621会议室
热电材料在废热发电和固态制冷方面有潜在的巨大商业价值，成为新能源技术的重要研究领域。近10年来，复杂结构的Zintl热电体系，由于其“电子晶体－声子玻璃”的结构特征和热电特质，而引起了越来越多的重视。Zintl相是金属间化合物的一部分子集，根据其各种不同的特殊共价键结构特征又可以继续细分。其中，具有二维共价键结构的层状CaAl2Si2-型Zintl相由于在p型和n型上突出的热电性能得到广泛关注。本报告集中探讨这类高性能热电半导体及其性能优化。
报告人：韩一龙，香港科技大学
时间： 5月23日（周二）15:00
单位：北京师范大学物理学系
地点：物理楼106
报告人：潘卫民，中科院高能所
时间：5月24日（周三）14:20
单位：中国科学院大学雁栖湖校区
地点：教一楼114教室
报告人：郑尧，澳大利亚阿德莱德大学
时间：5月25日（周四）13:30
单位：中科院理化技术研究所
地点：8号楼一楼会议室
5
Nanostructured Electrocatalysts
报告人：郑耿锋，复旦大学
时间：5月25日（周四）14:30
单位：中科院理化技术研究所
地点：8号楼一楼会议室
6
Defective Carbons for Electrochemical Reactions: A Defect Catalysis Mechanism
报告人：Xiangdong Yao，澳大利亚格里菲斯大学
时间：5月25日（周四）15:30
单位：中科院理化技术研究所
地点：8号楼一楼会议室
7
Lighting dark matter halos with galaxies
报告人：Xiaohu Yang，SJTU
时间： 5月25日（周四）16:00
单位：清华大学物理系
地点：郑裕彤讲堂
According to the current LCDM concordance cosmology, structures form hierarchically: i.e., smaller structures (dark matter halos) form earlier and can grow via the accretion and merging processes. The growth histories and spatial distributions of these dark matter halos play an important role in our understanding of the physical properties of the Universe. However, these dark matter halos are in general not directly observable. Thus, a key task in the cosmological studies is to establish a reliable link between invisible dark matter halos and visible galaxies. Such a link also sets the backbone of our understanding of galaxy formation and evolution. In this talk, I will present some of our recent probes in this field.
8
Imaging of Multi-Element and Multi-Valence Material Evolution in In-Situ Environmental TEM
报告人：Huolin Xin
时间： 5月26日（周五）10:30
单位：中科院物理研究所
地点：M253会议室
Many materials of interest in energy-related applications interact strongly with their constituents and environments, leading to complex interrelationships between structure, composition and bonding, all of which can change continuously during reactions. To address this complexity, it is highly desired to move beyond conventional transmission electron microscopy (TEM) projection imaging. Because projection images can be inconclusive for inhomogeneous systems, there is a dire need in the materials research community to track material changes in all three spatial coordinates with high time resolution at the nanoscale. However, a stumbling block is the rather slow process of acquiring electron tomography (ET) data to allow retrieval of depth information at the relevant length scales. In this talk, I will report the realization of high temporal resolution electron tomography, on-the-fly reconstruction, and the first attempt to achieve five-dimensional (5D) electron microscopy data sets under reaction conditions. The 5D data sets visualize the oxidation of a Co-Fe catalyst with unprecedented 3-D and chemical details and transform our understanding of adsorbate induced segregation in bimetallic systems. Case study of battery materials will also be included.
