Abstract

Conversion films of vanadium oxides are potentiodynamically generated on vanadium in acetate electrolyte systems at high voltages. The microstructure of the about 5 μm thin anodic films is investigated. X-ray diffraction and transmission electron microscopy indicate the films are complete amorphous. X-ray photoelectron spectroscopy (XPS) measurements show V 2p 3/2 binding energies of mixed valance vanadium sub oxides. Electron spin resonance (ESR) experiments on isolated films at 130 K point to paramagnetic V 4+ centers in a disordered octahedral oxygen surrounding.

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