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arXiv 0808.1263physics.atm-clusphysics.atom-ph
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杂质对Ni团簇熔化的影响

Impurity effects on the melting of Ni clusters

Andrey Lyalin, Adilah Hussien, Andrey V. Solov'yov, Walter Greiner

摘要:

我们证明,除了一个单一的碳杂质导致显着的变化,由一百多个原子组成的Ni团簇的热力学性质。诱导的变化的幅度取决于Ni-C相互作用的参数。因此,Ni团簇的热力学性质可以通过添加特定类型的杂质来有效地调节。我们还表明,碳杂质的存在下,在接近其熔点的温度下,大大改变了原子在Ni团簇中的迁移率和扩散。计算出的碳杂质在Ni团簇中的扩散系数可以用来估算碳纳米管的生长速率。

英文摘要:

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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