X-ray absorption fine structure study of amorphous metal oxide thin films prepared by photochemical metalorganic deposition
- Calgary
The oxidation state and local geometry of the metal centers in amorphous thin films of Fe{sub 2}O{sub 3} (Fe{sup 3+} oxidation state), CoFe{sub 2}O{sub 4} (Co{sup 2+}/Fe{sup 3+} oxidation states), and Cr{sub 2}O{sub 3} (Cr{sup 3+} oxidation state) are determined using K edge X-ray absorption near-edge structure (XANES) spectroscopy and extended X-ray absorption fine structure (EXAFS) spectroscopy. The metal oxide thin films were prepared by the solid-state photochemical decomposition of the relevant metal 2-ethylhexanoates, spin cast as thin films. No peaks are observed in the X-ray diffraction patterns, indicating the metal oxides are X-ray amorphous. The oxidation state of the metals is determined from the edge position of the K absorption edges, and in the case of iron-containing samples, an analysis of the pre-edge peaks. In all cases, the EXAFS analysis indicates the first coordination shell consists of oxygen atoms in an octahedral geometry, with a second shell consisting of metals. No higher shells are observed beyond 3.5 {angstrom} for all samples, indicating the metal oxides are truly amorphous, consistent with X-ray diffraction results.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- DOE - BASIC ENERGY SCIENCES
- OSTI ID:
- 1020574
- Journal Information:
- J. Solid State Chem., Vol. 184, Issue (5) ; 05, 2011; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- ENGLISH
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