Abstract
Abstract The faceting induced by Pd on W(111) has been research a lot in our laboratory. The bcc(111) surface is an unstable surface. Once more than one monolayer Pd is deposited on it and annealing to 700K~1000K, the structure of surface will transfer from planar (111) to faceting{112}, and pyramids with different size are formed on the surface. The reason we want to study Nb is that the work function of Nb (4.87eV) is lower than that of W (5.25eV) [11] and Nb is one of the superconductive material. Thus, if the faceting structure can be induced on Nb(111). The performance of Nb tip will be better than W tip in applications, such as field emission, high resolution electron microscopes or field ion guns. In an ultrahigh vacuum (UHV) chamber with a base pressure of 1 x 10-10 torr, we have used Low Energy Electron Diffraction (LEED) and Temperature Programmed Auger (TPA) to study the effect of adsorbates on the surface structure of Nb(111). That is, in O/Nb(111) systems, we observe the structure of the surface with LEED to see if any surface reconstruction occurs after annealing and analyze the structure.
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