SEMINAR

Solid-State Actinide Chalcogenides and Pnicitide

Prof. James A. Ibers

Charles E. and Emma H. Morrison Professor of Chemistry in Northwestern University

2010年4月2日（星期五）2:00 PM

四号楼 14楼　　 第二会议室

James A. Ibers教授：著名无机化学家和结晶学家，美国科学院和美国人文与科学院双院士。现美国西北大学化学系Charles E. and Emma H. Morrison 教授。长期从事新型硫族化合物设计合成及晶体结构表征，多篇论文发表于Nature，Angew Chemistry，JACS等。James A. Ibers教授分别于1951年与1954年获得加州理工学院学士与博士学位。

Solid-State Actinide Chalcogenides and Pnictides

Differences between transition-metal oxide structures and chalcogenide structures are striking. These include polyhedra other than tetrahedra and octahedra as building blocks in most chalcogenide structures; the absence of closest packing in many chalcogenide structures; the common occurrence of layered structures for transition-metal chalcogenides; the presence of Q-Q bonds (Q = S, Se, Te), that is Q_n^2- species, n = 2, in many chalcogenides; and finally the wide range of possible Q-Q bond lengths, especially for the tellurides. Because of these differences, metal chalcogenides, in particular the tellurides, show a very rich structural chemistry that is fundamentally different from that of the oxides. Metal chalcogenides show a wide range of physical properties, including low-temperature superconductivity and phenomena, such as charge-density waves and highly anisotropic behavior, associated with their low-dimensionality. Such systems have received little attention compared with the oxides.

联系人：陈立东　　 黄富强