Abstract
The electronic and structural characterization of vanadium functional centres in metal oxides by means of electron paramagnetic resonance (EPR) defines an important topic in solid-state research. In that respect, transfer of determined spin-Hamiltonian parameters into electronic and structural information often imposes a ‘bottleneck’ to interpret the obtained EPR spectra. Using two semi-empirical models, EPR spin-Hamiltonian parameters for tetravalent vanadium can be analysed first to distinguish between either V4+ and vanadyl VO2+-centres and second to determine the location of the corresponding centre either in the ‘bulk’ or at the surface region of metal oxide particles.
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