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Atomic Organization In Magnetic Bimetallic Nanoparticles: An Experimental And Theoretical Approach

Published online by Cambridge University Press:  01 February 2011

Marie-Claire Fromen
Affiliation:
CEMES, CNRS, 29 rue J. Marvig, B.P. 4347, 31055 Toulouse cedex, France
Samuel Dennler
Affiliation:
CEMES, CNRS, 29 rue J. Marvig, B.P. 4347, 31055 Toulouse cedex, France
Marie-José Casanove
Affiliation:
CEMES, CNRS, 29 rue J. Marvig, B.P. 4347, 31055 Toulouse cedex, France
Pierre Lecante
Affiliation:
CEMES, CNRS, 29 rue J. Marvig, B.P. 4347, 31055 Toulouse cedex, France
Joseph Morillo
Affiliation:
CEMES, CNRS, 29 rue J. Marvig, B.P. 4347, 31055 Toulouse cedex, France
Pascale Bayle–Guillemaud
Affiliation:
CEA, DRFMC, 17 rue des Martyrs, 38054 Grenoble, France
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Abstract

Ultrafine bimetallic CoRh nanoparticles synthesized by a soft chemical route with compositions ranging from pure cobalt to pure rhodium are investigated using high-resolution and energy filtering transmission electron microscopy techniques as well as wide angle x-ray scattering. In parallel, they are simulated with the use of an n-body semi-empirical interaction model: quenched molecular dynamics and Monte-Carlo Metropolis simulated annealing are performed on these nanoparticles in order to find their most stable isomers as a function of composition and size. A progressive evolution from an original polytetrahedral structure to the face-centered cubic structure with increasing Rh content is observed in these particles. Strong tendency to Co surface segregation is both experimentally evidenced and confirmed by the simulations.

Type
Research Article
Copyright
Copyright © Materials Research Society 2004

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References

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