Microstructure study of amorphous vanadium oxide films

Conversion films of vanadium oxides are potentiodynamically generated on vanadium in acetate electrolyte systems at high voltages. The microstructure of the about 5 mm 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 2p3r2 binding energies of mixed valance vanadium sub oxides. Electron spin resonance ESR.experiments on isolated films at 130 K point to paramagnetic V4q centers in a disordered octahedral oxygen surrounding. q1999 Elsevier Science B.V. All rights reserved