Anodic conversion films of vanadium oxides on vanadium were potentiodynamic
ally generated at high voltages in an acetate electrolyte system. The micro
structure of the anodic VOx coatings was characterized by surface and solid
-state techniques such as scanning electron microscopy, transmission electr
on microscopy, Raman spectroscopy, and x-ray photoelectron spectroscopy. An
amorphous structure is proposed in which network-forming [VO4] tetrahedra
in various degrees of condensation are connected by distorted [VO5] and [VO
6] units. Such polyhedra lead to the formation of nanocrystalline phases of
stoichiometric and substoichiometric vanadium oxides, which were observed
in the amorphous phase.