Surface Segregation in Multicomponent Clusters

Authors

Peter A. Dowben, University of Nebraska-LincolnFollow
Ning Wu, University of Nebraska-Lincoln
Natalie Palina, Physikalisches Institut der Universität BonnFollow
R. Müller, Institut für Physikalische Hochtechnologie, Jena, Germany
J. Hormes, Center for Advanced Microstructures and Devices, Louisiana State University
Yaroslav B. Losovyj, Indiana University- BloomingtonFollow

Date of this Version

10-17-2006

Comments

Published in Materials Research Society Symposium Proceedings (Symposium Q), Vol. 887 (2006), pp. 209–220. Copyright © 2006 Materials Research Society. Used by permission.

Abstract

Nanostructured materials are not immune from surface segregation, as can be shown for solid samples made from nanosized BaFe_12–2xCo_xTi_xO₁₉ barium ferrite particles and a variety of free clusters. Both theory and experiment provide ample demonstration that very limited dimensions of very small clusters does not necessarily impart stability against surface and grain boundary segregation. In fact, with the larger surface to volume ratio in small clusters and lower average atomic coordination, we anticipate that compositional instabilities in small clusters will readily occur.