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Size, shape and structure dependent cohesive energy and phase stability of metallic nanocrystals

机译:金属纳米晶体的尺寸,形状和结构相关的内聚能和相稳定性

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摘要

A model to account for the size, shape and structure dependent cohesive energy of metallic nanocrystals is developed in this contribution. It is predicted that the cohesive energy of nanocrystals decreases with decreasing the crystal size in specific shape, and decreases with increasing the shape factor in specific size. Furthermore, the model can be applied to predict the size and shape dependent phase stability of nanocrystal. To take Cr nanocrystal as an example, we found that there exists FCC structure for Cr crystal (the bulk structure is BCC) when the crystal size is small enough, and critical size of phase transition ranges from 249 to 824 atoms due to crystal shape variation, which is consistent with the corresponding experimental results. (c) 2006 Elsevier Ltd. All rights reserved.
机译:在这种贡献中,开发了一种模型,该模型考虑了金属纳米晶体的尺寸,形状和结构相关的内聚能。据预测,纳米晶体的内聚能随着特定尺寸的晶体尺寸的减小而减小,并且随着特定尺寸的形状因子的增大而减小。此外,该模型可用于预测纳米晶体的尺寸和形状相关的相稳定性。以Cr纳米晶体为例,我们发现当晶体尺寸足够小时,Cr晶体存在FCC结构(块状结构为BCC),并且由于晶体形状的变化,相变的临界尺寸范围为249至824个原子。 ,与相应的实验结果一致。 (c)2006 Elsevier Ltd.保留所有权利。

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