Abstract
The Ni-titania (TiO2) system was investigated to understand the phenomenon of titania encroachment on Ni surface as a function of temperature and oxygen partial pressure (PO2) under reducing atmosphere. A network-structured Ni film with widths of about 10μm was prepared on titania. It is found that encroachment of non-stoichiometric TiO2−x to the Ni surface occurs when TiO2 is reduced to TiO2−x with random point defects, as the PO2 is within the range defined by Ni-NiO and TiO2−x–TinO2n−1 equilibria. On the other hand, no encroachment to the Ni surface occurs at much lower PO2, where TiO2 is reduced further to the Magneli phase TinO2n−1 with ordered shear structure. A possible driving force for TiO2−x encroachment to the Ni surface may be attributed to the high surface energy of TiO2−x with disordered point defects. Furthermore, these results indicate the possible role of fast Ti diffusion in TiO2−x which drives its encroachment to the Ni surface.
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