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Solid products obtained from calcium hydroxylapatite suspensions in diluted VO 2+  solutions, under different experimental conditions, were investigated by means of X-ray powder diffractometry and IR and ESR spectroscopy. It is demonstrated that the VO 2+  cation cannot be incorporated into the apatite-lattice but is strongly adsorbed on the surface of the material. Different aspects of this adsorption were thoroughly investigated. The ESR spectra suggest an inhomogeneous distribution of the adsorbed species and the generation of O = V (O) 4  moieties, which show a high stability towards oxidation.

Über die Wechselwirkung des Vanadyl(IV)-Kations mit Calcium-Hydroxylapatit / The Interaction of the Vanadyl(IV) Cation with Calcium Hydroxylapatite