Investigation of the mixed-valent system V2-xMoxO5 by XPS
Autor(en): | Demeter, M. Bartkowski, St. Kurmaev, E.Z. Neumann, M. Cherkashenko, V.M. Volkov, V.L. Zakharova, G.C. |
Stichwörter: | Binding energy; Electric properties; Electron energy levels; Energy gap; X ray photoelectron spectroscopy, Core level; Mixed valence; Vanadium oxide, Vanadium compounds | Erscheinungsdatum: | 1999 | Herausgeber: | Society of Photo-Optical Instrumentation Engineers, Bellingham | Journal: | Proceedings of SPIE - The International Society for Optical Engineering | Volumen: | 3724 | Startseite: | 296 | Seitenende: | 300 | Zusammenfassung: | A series of V2-xMoxO5 (x=0.2, 0.4, 0.6, 0.8) samples has been investigated by X-ray photoelectron spectroscopy (XPS). MoO3, VO2, V2O5 (powders), VO2(c) and Na0.33 V2O5(c) have been used as reference samples. According to the XPS measurements, the valence of Mo atoms in this series is not changed during the Mo doping and it is close to that of MoO3. The V atoms show a mixed valence in the V2-xMoxO5 system: with increasing of the Mo content, a higher concentration of tetravalent V atoms is observed. For one sample of this series, V1.2Mo0.8O5, it was found that the XPS valence band and also the core level spectra are close to those of another mixed-valence system, Na0.33V2O5. Both compounds show similar electrical properties, which can be interpreted in terms of a two-level hopping model. It is concluded that the impurity states in the band gap of both compounds have 3d like character and they are formed at the expense of the additional electrons of Mo or Na. |
Beschreibung: | Conference of Proceedings of the 1998 International Conference on Solid State Crystals, ICSSC'98 : Epilayers and Heterostructures in Optoelectronics and Semiconductor Technology ; Conference Date: 12 October 1998 Through 16 October 1998; Conference Code:55145 |
ISSN: | 0277786X | DOI: | 10.1117/12.343010 | Externe URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032684030&doi=10.1117%2f12.343010&partnerID=40&md5=59a17e9e368022a53fb39e233a48d32d |
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