Impurity effects on the melting of Ni clusters

Details Impurity effects on the melting of Ni clusters Impurity effects on the melting of Ni clusters

2008-08-08

arxiv.org/abs/0808.1263v1

Phys. Rev. B 79, 165403, (2009)

Physics

Atomic and Molecular Clusters

27 pages, 13 figures

Scientific paper

10.1103/PhysRevB.79.165403

We demonstrate that the addition of a single carbon impurity leads to significant changes in the thermodynamic properties of Ni clusters consisting of more than a hundred atoms. The magnitude of the change induced is dependent upon the parameters of the Ni-C interaction. Hence, thermodynamic properties of Ni clusters can be effectively tuned by the addition of an impurity of a particular type. We also show that the presence of a carbon impurity considerably changes the mobility and diffusion of atoms in the Ni cluster at temperatures close to its melting point. The calculated diffusion coefficients of the carbon impurity in the Ni cluster can be used for a reliable estimate of the growth rate of carbon nanotubes.

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