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Issue 42, 2015
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Dynamics and stability of icosahedral Fe–Pt nanoparticles

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Abstract

The structure, dynamics and stability of Fe–Pt nanoparticles have been investigated using DFT-based techniques: total energy calculations and molecular dynamics. The investigated systems included multi-shell and disordered nanoparticles of iron and platinum. The study concerns icosahedral particles with the magic number of atoms (55): iron-terminated Fe43Pt12, platinum-terminated Fe12Pt43, and disordered Fe27Pt28. Additionally, the Fe6Pt7 cluster has been investigated to probe the behaviour of extremely small Fe–Pt particles. Molecular dynamics simulations have been performed for a few temperatures between T = 150–1000 K. The calculations revealed high structural instability of the Fe-terminated nanoparticles and a strong stabilising effect of the Pt-termination in the shell-type icosahedral particles. The platinum termination prevented disordering of the particle even at T = 1000 K indicating very high melting temperatures of these Fe–Pt icosahedral structures. The analysis of evolution of the radial distribution function has shown a significant tendency of Pt atoms to move to the outside layer of the particles – even in the platinum deficient cases.

Graphical abstract: Dynamics and stability of icosahedral Fe–Pt nanoparticles

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Publication details

The article was received on 16 Jan 2015, accepted on 03 Mar 2015 and first published on 04 Mar 2015


Article type: Paper
DOI: 10.1039/C5CP00277J
Citation: Phys. Chem. Chem. Phys., 2015,17, 28096-28102
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    Dynamics and stability of icosahedral Fe–Pt nanoparticles

    P. T. Jochym, J. Łażewski, M. Sternik and P. Piekarz, Phys. Chem. Chem. Phys., 2015, 17, 28096
    DOI: 10.1039/C5CP00277J

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