X-ray-absorption near-edge structure of titanium and vanadium in (Ti,V)O2rutile solid solutions

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Abstract
An improved smoothing procedure is used to extract more information from x-ray-absorption spectra by second-derivative analysis. The true energy position of the maxima and full width at half maximum are measured for all features. The excitonic peak is present for all compositions and is well correlated with the 3d-electron density. A weak structural change appears around the titanium atom whereas a structure change is more detectable around the vanadium atom. The crystal-field splitting seems to be largely determined by V-V interactions. No electron transfer occurs between titanium and vanadium as the V 3d level is about 1 eV below the Ti 3d level. This is done by aligning the two edges with a 498.3-eV shift.