The Behavior of Rare Earth Ions in Hydroxyapatite Crystal

摘要

Rare earth ion-doped hydroxyapatite (Ln-doped HAp) samples were prepared in order to make clear the behavior of rare earth (Ln) ions living body system. Photoluminescence (PL) spectra of hydroxyapatite (HAp) had no emission peak, and that of Ln-doped HAp samples had a lot of emission peaks due to f - f electron transition of Ln~(3+). The emission peak intensity of fired Ln-doped HAp samples is higher than that of unfired Ln-doped HAp samples. These XRD traces of the unfired samples are similar to that of HAp, while XRD traces of the fired samples were observed that the diffraction angle of all peaks shifts to higher with an increase in the concentration of rare earth ion in each aqueous solution. These results suggest that trivalent rare earth ions are substituted for Ca~(2+) ion in HAp crystals.