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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1004.3948cond-mat.mtrl-sciphysics.comp-ph
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全电子DFT作用下Pt(100)和Au(100)的大尺度表面重构能学

Large-scale surface reconstruction energetics of Pt(100) and Au(100) by all-electron DFT

Paula Havu, Volker Blum, Ville Havu, Patrick Rinke, Matthias Scheffler

摘要:

Au和Pt的低折射率表面都倾向于重构,这一事实在许多纳米结构、催化和电化学应用中至关重要。值得注意的是,即使在今天,关于它们的结构能的一些重要问题仍然存在,特别是对于大规模的准六边形重构(100)表面:在现有的实验中,Au和Pt的重构能相当不同,并且实验和理论对Pt不匹配。在这里,我们通过全电子密度泛函理论表明,只有足够大的“(5 × N)”近似超晶胞才能捕获Au(100)和Pt(100)之间的定性重构能量趋势,这与理论文献中经常做的相反。它们的大小实际上是相似的,并且更接近Pt(100)的测量值;我们的计算与已知的几何特征非常一致,并为电子重建驱动力提供了直接证据。

英文摘要:

The low-index surfaces of Au and Pt all tend to reconstruct, a fact that is of key importance in many nanostructure, catalytic, and electrochemical applications. Remarkably, some significant questions regarding their structural energies remain even today, in particular for the large-scale quasihexagonal reconstructed (100) surfaces: Rather dissimilar reconstruction energies for Au and Pt in available experiments, and experiment and theory do not match for Pt. We here show by all-electron density-functional theory that only large enough "(5 x N)" approximant supercells capture the qualitative reconstruction energy trend between Au(100) and Pt(100), in contrast to what is often done in the theoretical literature. Their magnitudes are then in fact similar, and closer to the measured value for Pt(100); our calculations achieve excellent agreement with known geometric characteristics and provide direct evidence for the electronic reconstruction driving force.

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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