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arXiv 1803.08400cond-mat.mtrl-sciphysics.chem-ph
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铁原子间相互作用势模型的性能:phase diagrams模型的比较

On the performance of interatomic potential models of iron: comparison of the phase diagrams

Livia B. Partay

摘要:

为了研究原子间相互作用势在高压下的性能及其可靠性,比较了铁的四种不同嵌入原子型势模型的相图。在0.1 GPa-100 GPa的压力范围内,通过嵌套取样技术进行计算。在所有情况下,低压稳定结构都是体心立方结构,但高压相变化很大,是面心立方结构,六方密排结构,在很低的温度下,还观察到不同的体心四方相。熔化线被高估了相当大的三个模型,但对于一个液体的性质已被考虑在潜在的拟合过程中,与实验结果的一致性是好的,即使在非常高的压力。

英文摘要:

In order to study the performance of interatomic potentials and their reliability at higher pressures, the phase diagram of four different embedded-atom type potential models of iron is compared. The calculations were done by the nested sampling technique in the pressure range 0.1 GPa-100 GPa. The low pressure stable structure is found to be the body- centred cubic in all cases, but the higher pressure phases show a great variation, being face-centred cubic, hexagonal close-packed and - at very low temperatures - different body-centred tetragonal phases are observed as well. The melting line is overestimated considerably for three of the models, but for the one where liquid properties had been taken into account during the potential fitting process, the agreement with experimental results is good, even at very high pressures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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