Synthesis and characterization of cadmium-calcium hydroxyapatite solid solutions

  • Xin Zhao
  • Yi-nian Zhu
  • Liu-qin Dai


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.


hydroxyapatite solid solutions cadmium calcium substitution 


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© University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.College of Light Industry and Food EngineeringGuangxi UniversityNanningChina
  2. 2.College of Environmental Science and EngineeringGuilin University of TechnologyGuilinChina

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