Study of the electronic structure of rhenium and tungsten oxides on the O K-edge |
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Authors: | J. Purans A. Kuzmin Ph. Parent C. Laffone |
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Affiliation: | (1) Institute of Solid State Physics, Kengaraga street 8, LV-1063 Riga, Latvia;(2) LURE, Université Paris-Sud, Bat. 209D, 91405 Orsay Cedex, France |
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Abstract: | Oxygen K-edge x-ray absorption spectra were studied on the electrochromic amorphous thin film a-WO3 in the comparison with crystalline oxides having variable electronic (d0, d1, d2) and atomic structure: monoclinic m-WO3 (insulator - d0), cubic Na0.6WO3 (metal - d1), cubic ReO3 (metal - d1), layered-type hexagonal h-WO3, WO3H2O and with intercalated HxReO3 (metal - d2), HxWO3 oxides having a metal-isulating transition. The changes in the XANES range 10–15 eV above the absorption edge are interpreted based on the known band-structure calculations. The high-energy features are related to the multiple-scattering processes (EXAFS) on the nearest atoms. The intensity of the feature at 550–560 eV is attributed for the first time to the value of the metal-oxygen-metal bond angle. Paper presented at the 5th Euroconference on Solid State Ionics, Benalmádena, Spain, Sept. 13–20, 1998. |
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