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Theoretical study o...
Theoretical study of the thermal behaviour of free and alumina-supported Fe-C nanoparticles
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Jiang, A. (författare)
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Awasthi, N. (författare)
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Kolmogorov, A. N. (författare)
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Setyawan, W. (författare)
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- Börjesson, A. (författare)
- Högskolan i Borås,Institutionen Ingenjörshögskolan
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- Bolton, Kim (författare)
- Gothenburg University,Göteborgs universitet,Högskolan i Borås,Institutionen Ingenjörshögskolan,Institutionen för fysik (GU),Department of Physics (GU)
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Harutyunyan, A. (författare)
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Curtarolo, S. (författare)
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(creator_code:org_t)
- American Physical Society, 2007
- 2007
- Engelska.
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Ingår i: Physical Review B Condensed Matter. - : American Physical Society. - 0163-1829 .- 1095-3795. ; 75:20
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://gup.ub.gu.se...
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Abstract
Ämnesord
Stäng
- The thermal behavior of free and alumina-supported iron-carbon nanoparticles is investigated via molecular-dynamics simulations, in which the effect of the substrate is treated with a simple Morse potential fitted to ab initio data. We observe that the presence of the substrate raises the melting temperature of medium and large Fe1-xCx nanoparticles (x=0-0.16, N=80-1000, nonmagic numbers) by 40-60 K; it also plays an important role in defining the ground state of smaller Fe nanoparticles (N=50-80). The main focus of our study is the investigation of Fe-C phase diagrams as a function of the nanoparticle size. We find that as the cluster size decreases in the 1.1-1.6-nm-diameter range, the eutectic point shifts significantly not only toward lower temperatures, as expected from the Gibbs-Thomson law, but also toward lower concentrations of C. The strong dependence of the maximum C solubility on the Fe-C cluster size may have important implications for the catalytic growth of carbon nanotubes by chemical-vapor deposition.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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