Molecular Dynamics Simulations of Melting Iron Nanoparticles with/without Defects Using a Reaxff Reactive Force Field

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作者：
Junlei Sun
Pingan Liu
Mengjun Wang
Junpeng Liu
机构：
[1] College of Aerospace and Civil Engineering,
[2] Harbin Engineering University,undefined
[3] Heilongjiang Province,undefined
[4] Key Laboratory of Dual Dielectric Power Technology,undefined
[5] Hebei Hanguang Industry Co. Ltd,undefined
来源：
Scientific Reports | / 10卷
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摘要：
Molecular dynamics simulations are performed to study thermal properties of bulk iron material and Fe nanoparticles (FNP) by using a ReaxFF reactive force field. Thermodynamic and energy properties such as radial distribution function, Lindemann index and potential energy plots are adopted to study the melting behaviors of FNPs from 300 K to 2500 K. A step-heating method is introduced to obtain equilibrium melting points. Our results show ReaxFF force field is able to detect size effect in FNP melting no matter in energy or structure evolution aspect. Extra storage energy of FNPs caused by defects (0%-10%) is firstly studied in this paper: defects will not affect the melting point of FNPs directly but increase the system energy especially when temperature reaches the melting points.
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