A study of electronic structures of Pt3M (M=Ti,V,Cr,Fe,Co,Ni) polycrystalline alloys with valence-band photoemission spectroscopy |
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| Authors: | Mun Bongjin Simon Watanabe Masamitsu Rossi Massimiliano Stamenkovic Vojislav Markovic Nenad M Ross Philip N |
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| Institution: | Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. bsmun@lbl.gov |
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| Abstract: | The surface valence-band densities of states (DOS) of Pt(3)M (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. |
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