Nanostructures on TiO2 and CeO2 have been created by treatment under ultrahigh vacuum conditions. Crystallographic shear in the bulk of rutile TiO2 leads to line structures on the (110) surface. Regular trenches have been observed after calcium segregation to the (110) surface of TiO2. Network structures formed by self-organisation are formed after high temperature anneal and rapid cooling of TiO2(001). On CeO2(111) regularly arranged defect types of various shapes have been observed. The examples illustrate that a scanning tunnelling microscopy is a suitable tool for studies of surface structures on the nanometre scale.
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