Abstract
Titanium-cerium-calcium hydroxyapatite (TiCeCaHap) solid solution particles were synthesized by a precipitation method and their structure was investigated by various means. Titanium (Ti4+) ions and cerium (Ce3+) ions could be incorporated into the hydroxyapatite (Hap) structure at (Ti + Ce)/cation ratios ranging from 0 to 0.06 when the amounts of Ti4+ ions and Ce3+ ions were equal. The TiCeCaHap particles were fine ellipsoidal particles. Long rod-like particles and irregular shaped particles were mixed with the ellipsoidal TiCeCaHap particles when they were prepared under synthesis conditions with higher contents of Ti4+ and Ce3+ ions. The incorporated Ti4+ and Ce3+ ions affected the structure of the TiCeCaHap particles, especially the particle length and the crystallite size due to the (00c) plane. Moreover, the incorporation of Ti4+ and Ce3+ ions increased the ultraviolet (UV) absorptive ability of the particles. The Ti4+ ions increased the UV absorptive ability in the range of 260–300 nm, and the Ce3+ ions increased the UV absorptive ability in the range of 300–400 nm. The TiCeCaHap particles exhibited stronger and wider UV absorption at 260–400 nm than the titanium-calcium hydroxyapatite (TiCaHap) and cerium-calcium hydroxyapatite (CeCaHap) particles.
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