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Surface Segregation in Multicomponent Clusters

Published online by Cambridge University Press:  26 February 2011

Peter A. Dowben ,
Ning Wu ,
Natalie Palina ,
Hartwig Modrow ,
Robert Müller ,
Josef Hormes  and
Yaroslav B. Losovyj
Peter A. Dowben
Affiliation:
pdowben@unl.edu, University of Nebraska, Physics and Astronomy, P.O. Box 880111, 116 Brace Laboratory, Lincoln, NE, 68588-0111, United States, 402-472-9838, 402-2879
Ning Wu
Affiliation:
ningwu@bigred.unl.edu, University of Nebraska, Physics and Astronomy, United States
Natalie Palina
Affiliation:
palina@physik.uni-bonn.de, Universität Bonn, Physikalisches Institut, Germany
Hartwig Modrow
Affiliation:
modrow@physik.uni-bonn.de, Universität Bonn, Physikalisches Institut, Germany
Robert Müller
Affiliation:
robert.mueller@ipht-jena.de, Institut für Physikalische Hochtechnologie, Germany
Josef Hormes
Affiliation:
hormes@lsu.edu, Louisiana State University, Center for Advanced Microstructures and Devices, United States
Yaroslav B. Losovyj
Affiliation:
ylosovyj@lsu.edu, Louisiana State University, Center for Advanced Microstructures and Devices, United States
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Abstract

Nanostructured materials are not immune from surface segregation, as can be shown for solid samples made from nanosized BaFe12−2xCoxTixO19 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.

Keywords

cluster assemblysurface chemistryphotoemission
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 887: Symposium Q – Degradation Processes in Nanostructured Materials , 2005 , 0887-Q05-01
Copyright
Copyright © Materials Research Society 2006

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References

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