engleski

Chemical effects on the Kb' and Kb2, 5 x-ray lines of titanium and its compounds

High-resolution K beta x-ray spectra induced by 2 MeV protons in thick Ti, TiO, Ti2O3, TiO2, MgTiO3, FeTiO3, TiC, TiN, and TiB2 targets were measured using a wavelength dispersive spectrometer combined with a position-sensitive detector. The intensities and energies of the K beta(2, 5) and K beta(') lines relative to the K beta(1, 3) line were extracted. The influence of self-absorption in thick targets was investigated using related x-ray-absorption near-edge-structure spectra that are available in the literature to extract mass absorption coefficients close to the K absorption edge. The correlation of the relative position of the K beta(2, 5) line with a titanium formal oxidation state in oxide compounds confirmed that the oxidation state of Ti in FeTiO3 is probably a mixture of Ti III and Ti IV states, which has been recently reported by other authors using different methods. The strengths of the K beta(2, 5) and K beta(') transition probabilities per titanium-ligand pair were found to decrease exponentially as the average titanium-ligand bond distance increased, which is similar to results obtained for various compounds with vanadium or manganese as the central 3d metal atoms.

titanium compounds; x-ray emission; x-ray absorption; oxidation state; high-resolution; kbeta spectrum; PIXE

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