Effects of fluorine on the structure of fluorohydroxyapatite: a study by XRD, solid-state NMR and Raman spectroscopy

For the first time we observed well-resolved Ca(i) and Ca(ii) signal changes in fluorohydroxyapatites with different fluorine contents by solid state NMR. The experiment results show that fluorine ions perturb the chemical environment of Ca(ii) ions and OH- ions more than phosphorus tetrahedra and Ca(i) ions.