Abstract
Apatite-type solid solutions with the formula Ca10(PO4)6FexOyHz containing Fe atoms in the channel sites of Ca10(PO4)6(OH)2 were successfully synthesized by impregnation with aqueous solution of Fe, followed by heat treatment at 1150 °C in air and cooling to room temperature. The unit cell volume of Ca10(PO4)6FexOyHz increased with increasing Fe content. The results of structural refinement using powder X-ray diffraction data and Raman spectroscopy suggested that the incorporated Fe ions occupied four-fold sites, away from the center of the channel in the apatite lattice. This method may be useful for synthesizing novel apatite-type functional materials containing transition metals.
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