Abstract
Method of scanning tunneling microscopy (STM) has been used to investigate a clean Nb(110) face and lowdimensional quasiperiodic NbO structures on the Nb(110) face formed during hightempera� ture annealing of a single crystal in a vacuum. It is shown that the structures of the NbO type are present on the Nb(110) face in the form of linear rows (chains) consisting of 10 ± 1 atoms of niobium surrounded by oxy� gen atoms. The height of the NbO structures above the Nb(110) surface and the spacing between the adjacent chains have been determined to be d ~ 1.2 A and L ~ 13 A, respectively. Two possible orientations of NbO structures in the directions 111 of the Nb(110) surface are demonstrated; the structures are mounted into domains. An atomic model of the NbO/Nb(110) surface is suggested.
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