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Second moment approximation of tight-binding potential for γFe applicable up to 1700 K

机译:适用于1700 K以下的γFe的紧束缚势的第二矩近似

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摘要

The atomic potential of γFe has been constructed on the basis of the second-moment approximation of the tight-binding scheme potential. To apply this potential to molecular dynamics simulations at high temperatures up to about 1700 K, the cut-off distance has been set to the sixth neighbours and other parameters have been determined from fitting to physical properties of γFe such as the cohesive energy, vacancy formation energy, lattice constant, elastic constants and bulk modulus. This potential can also describe the temperature dependencies of the lattice constant and the specific heat at constant pressure and can simulate hypothetical melting of γFe.
机译:γFe的原子电势是根据紧密结合方案电势的第二矩近似构造的。为了将此潜能应用于最高约1700 K的高温下的分子动力学模拟,已将截止距离设置为第六个邻域,并且已根据适合γFe的物理性质(例如内聚能,空位形成)确定了其他参数。能量,晶格常数,弹性常数和体积模量。该电势还可以描述晶格常数和恒定压力下比热的温度依赖性,并且可以模拟γFe的假设熔化。

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