期刊
SURFACE SCIENCE
卷 605, 期 1-2, 页码 158-165出版社
ELSEVIER
DOI: 10.1016/j.susc.2010.10.014
关键词
Barium titanate; Surface termination; X-ray photoelectron spectroscopy; Photoelectron diffraction; Metastable induced electron spectroscopy; Forward scattering
资金
- Deutsche Forschungsgemeinschaft [SFB 762]
The surface termination of oxide surfaces is of crucial importance for the growth of a second material like metals or other oxides. In this study we have investigated the surface of a BaTiO3 (001) single crystal during sample preparation by various electron spectroscopic methods. It is shown by X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS) and metastable induced electron spectroscopy (MIES) that during sputtering a Ba rich overlayer is formed, in which the Ba2+ ions are under coordinated. Below this layer, an oxygen deficient BaTiO3 layer is found. During annealing, we observe the reformation of the crystalline structure. UP and MIE spectra provide clear evidence of a BaO terminated surface. X-ray photoelectron diffraction studies support this result, comparing recorded polar angle scans with calculated intensity modulations using multiple scattering cluster models. (C) 2010 Elsevier B.V. All rights reserved.
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