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A molecular dynamics examination of the relationship between self-diffusion and viscosity in liquid metals
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10.1063/1.4723683
/content/aip/journal/jcp/136/21/10.1063/1.4723683
http://aip.metastore.ingenta.com/content/aip/journal/jcp/136/21/10.1063/1.4723683
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Self-diffusion coefficients for elemental Ni and Cu as a function of temperature. (a) Values for Ni in the temperature range , and (b) values for Cu in the temperature range . The dashed lines are results from a fit to the Arrhenius law.

Image of FIG. 2.
FIG. 2.

Viscosity of elemental Cu (a) and Ni (b) as a function of temperature. The dashed lines are fits to the Arrhenius law.

Image of FIG. 3.
FIG. 3.

Number density for liquid Ni-Si alloys as a function of temperature. The abrupt increases below 900 and indicate the occurrence of crystallization for Ni95Si5 and Ni90Si10, respectively. For Ni80Si20 and Ni75Si25, the glass transitions are identified below

Image of FIG. 4.
FIG. 4.

Self-diffusion coefficients for liquid Ni-Si alloys. (a) Ni95Si5, (b) Ni90Si10, (c) Ni80Si20, and (d) Ni75Si25. The solid and dashed lines are fits to the Arrhenius and power laws.

Image of FIG. 5.
FIG. 5.

Viscosity for liquid Ni-Si alloys as a function of temperature. (a) Ni95Si5, (b) Ni90Si10, (c) Ni80Si20, and (d) Ni75Si25. The solid and dashed lines are the results fitted by the Arrhenius and power laws.

Image of FIG. 6.
FIG. 6.

Dη as a function of temperature for elemental Ni (a) and Cu (b). The solid and dashed lines are fits to the Arrhenius law and the linear relation, respectively.

Image of FIG. 7.
FIG. 7.

Dη as a function of temperature for Ni-Si alloys. (a) Ni95Si5, (b) Ni90Si10, (c) Ni80Si20, and (d) Ni75Si25. Dη is separated into two temperature regions. Decoupling of D and η is illustrated above the crystallization of Ni95Si5 and Ni90Si10, and coupling is observed in Ni80Si20 and Ni75Si25.

Image of FIG. 8.
FIG. 8.

Distribution of solid-like clusters in Ni-Si melts. (a) The number of solid-like clusters as a function of temperature, (b) the maximum size of solid-like clusters as a function of temperature. The solid fits to exponential decay and linear functions, respectively.

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/content/aip/journal/jcp/136/21/10.1063/1.4723683
2012-06-04
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A molecular dynamics examination of the relationship between self-diffusion and viscosity in liquid metals
http://aip.metastore.ingenta.com/content/aip/journal/jcp/136/21/10.1063/1.4723683
10.1063/1.4723683
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