Synthesis and characterization of cadmium-calcium hydroxyapatite solid solutions

Xin Zhao¹，Yi-nian Zhu²，Liu-qin Dai²

1. College of Light Industry and Food Engineering, Guangxi University2. College of Environmental Science and Engineering, Guilin University of Technology

摘 要：A series of cadmium-calcium hydroxyapatite solid solutions was prepared by an aqueous precipitation method. By various means,the characterizations confirmed the formation of continuous solid solutions over all ranges of Cd/（Cd+Ca） atomic ratio. In the results, both lattice parameters a and c display slight deviations from Vegard’s rule when the Cd/（Cd+Ca） atomic ratio is greater than 0.6. The particles change from smaller acicular to larger hexagonal columnar crystals as the Cd/（Cd+Ca） atomic ratio increases from 0–0.60 to 0.60–1.00. The area of the phosphate peak for symmetric P–O stretching decreases with the increase in Cd/（Cd+Ca） atomic ratio, and the peak disappears when the Cd/（Cd+Ca） atomic ratio is greater than 0.6; the two phosphate peaks of P–O stretching gradually merge together for the Cd/（Cd+Ca） atomic ratio near 0.60. These variations can be explained by a slight tendency of larger Cd ions to occupy M（2） sites and smaller Ca ions to prefer M（1） sites in the structure.

关键词：