OXIDATION OF Nb(001) STUDIED BY HIGH-RESOLUTION CORE-LEVEL PHOTOEMISSION

W.-S. Lo, H.-H. Chen, T.-S. Chien, C.-C. Tsan and B.-S. Fang
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W.-S. Lo: Research Division, Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
H.-H. Chen: Center for Measurement Standards, ITRI, Hsinchu, Taiwan, ROC
T.-S. Chien: Research Division, Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
C.-C. Tsan: Department of Physics, National Tsing Hua University, Hsinchu, Taiwan, ROC
B.-S. Fang: Research Division, Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC;

Surface Review and Letters (SRL), 1997, vol. 04, issue 04, 651-654

Abstract: Using high-resolution core-level photoemission with synchrotron radiation, we observed two suboxide states on the Nb(001) surface, which was heated in1×10-6TorrO2for several hours and then annealed several times at high temperatures in an ultrahigh-vacuum condition. These suboxide states were identified asNb2Oand NbO from theNb3d5/2core-level photoemission spectra. The relative amounts of these suboxide states varied with the annealing temperature, showing that at progressively higher temperatures more oxygen-deficient oxides were produced. Meanwhile, LEED patterns of the complex superstructures of the oxidized surfaces also changed. Many of these findings are analogous with other oxidized refractory metals.

Keywords: 61.72.Cc; 73.20.-r; 79.60.-i (search for similar items in EconPapers)
Date: 1997
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DOI: 10.1142/S0218625X9700064X

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