Photoelectron spectra and surface valence fluctuation of Eu in the misfit-layer compound {(EuS)1.15}1.5NbS2 |
| |
| Affiliation: | 1. Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Av. Libertador B. O’Higgins 3363, Santiago, Chile;2. Academia Politécnica Aeronáutica, Fuerza Aérea de Chile, Gran Avenida J.M. Carrera 11087, Santiago, Chile;3. Institut für Biochemie, Universität Greifswald, Felix-Hausdorff-Str. 4, D-17487 Greifswald, Germany;1. Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University, Clayton, Victoria 3800, Australia;2. Cardiovascular Research Institute, Yong Loo Lin School of Medicine, National University of Singapore, National University Health System, Centre for Translational Medicine, Singapore 117599, Singapore;1. Department of Physics, Asansol Girls’ College, Asansol 713304, India;2. Department of Physics, Triveni Devi Bhalotia College, Raniganj 713347, India;1. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, Jilin, PR China;2. State Key Laboratory of Superhard Materials and College of Physics, Jilin University, Changchun 130023, PR China |
| |
| Abstract: | The 1.5Q/1 H type of the misfit layer compound {(EuS)1.15}1.5NbS2 has been studied by X-ray photoelectron spectroscopy. Eu 3d, 4d, 4f and 5p spectra are measured with Al and MgKα radiation. Their intensities are analyzed, taking the escape depth of photoelectrons emitted from the core levels into account. The results indicate that valence transfer of nearly-half Eu2+ ions to Eu3+ happens in the outermost surface layer and a reduced Eu–S distance brings about surface rearrangement. It is confirmed that Eu2+ and Eu3+ coexist in a bulk, in consistency with bond valence calculations and Mössbauer spectra. The XPS spectra are well interpreted in terms of the multiplet structures of Eu2+ and Eu3+. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
