微晶
价带
材料科学
光电发射光谱学
反向光电发射光谱
角分辨光电子能谱
价(化学)
电子结构
光谱学
X射线光电子能谱
凝聚态物理
冶金
核磁共振
化学
带隙
物理
光电子学
有机化学
量子力学
作者
Bongjin Simon Mun,Masamitsu Watanabe,Massimiliano Rossi,Vojislav R. Stamenković,Nenad M. Marković,Philip N. Ross
摘要
The surface valence-band densities of states (DOS) of Pt3M (M=Ti,V,Cr,Fe,Co,Ni) polycrystalline alloys were investigated with ultraviolet photoemission spectroscopy. Upon annealing the ion-sputter-cleaned alloys at high temperatures, the observed valence-band DOS spectra clearly show the modified electronic structures on the surfaces suggesting the surface segregation of Pt as predicted in thermodynamic models. The measured d-band centers and widths for the annealed alloy surfaces show qualitatively the same trend as predicted by density-functional-theory calculations based on the model of a Pt “skin” on the topmost surface layer and a subsurface layer enriched in the 3d transition metal.
科研通智能强力驱动
Strongly Powered by AbleSci AI