Univ of Tennessee, Knoxville
Layered Atom Patterns and Atomic Ordering in Complex Oxides
Location: EB1 Room 1011
Friday, April 4th 2014 - 11:00 am
Complex oxides, that is, oxides with multiple cation constituents, often form crystal structures based on simple layered atomic stacking arrangements, but with special atomic patterns within these layers. These atom patterns can be ordered or disordered, depending on stoichiometry or alternatively, depending on physical effects such as thermal or radiation-induced entropic disorder.
In this presentation, we will consider a layered structure model to describe atomic arrangements in a variety of oxides, from corundum to spinel to fluorite to pyrochlore. We will examine how atomic order varies as a function of compound stoichiometry and how atomic disorder is accommodated within these structures. We will also relate these layered atom arrangements to important physical phenomena, such as fast ion conduction and radiation damage resistance.
Kurt Sickafus joined the University of Tennessee in August 2011 as the head of the Department of Materials Science and Engineering. Kurt graduated from Ohio Wesleyan University in 1978 and received his Ph.D. degree from Cornell University in 1985 (Materials Science & Engineering). Kurt also worked as a postdoctoral researcher in the Cavendish Laboratory, University of Cambridge (1985-1987) and as a staff member at I.B.M. (1987-88) and at Los Alamos National Laboratory (1989-2011). Kurt's primary expertise is in the area of radiation damage effects in ceramics, especially the radiation damage behavior of complex oxides. Kurt is a Fellow of both Los Alamos National Laboratory and the American Ceramic Society.