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

  Multicomponent Clathrates EA₈(M,M')_x[Si,Ge]_46-x-y_y 　

   Speaker：Prof. Dr. Peter Rogl

 Institute of Physical Chemistry,

University of Vienna, Austria

Abstract: Among the manifold of “intermetallic” clathrates, hitherto two series of clathrate type I compounds have shown interesting TE properties: EA8M16Ge30 and EA₈(M,M')_x[Si,Ge]_46-x-y_y (EA=earth alkaline metal). The talk focuses on a systematic study of clathrate formation, clathrate structures, bonding and structure-property relation in novel multicomponent clathrate type I materials EA₈(M,M')_x[Si,Ge]_46-x-y_y where M, M' are predominantly 3d, 4d, 5d elements. Details of phase equilibria will be given for the 3d M elements. Physical as well as mechanical properties have been evaluated particularly with respect to thermoelectric applications. The present analysis shows the difficulties in preparation and design of clathrate compounds at a given electron/atom concentration. Validity and shortcomings of the Zintl concept for clathrates will be outlined. The correlations obtained may provide useful in defining compositional regions of interest for further search for novel clathrate materials with interesting thermoelectric properties.

 时间：11月11日 （星期三）上午10:00am

地点： 2号楼607会议室

联系人：陈立东、张文清研究员 (2416)