Calcified Tissue International

, Volume 33, Issue 1, pp 243–247

Lattice parameters and cation distribution of solid solutions of calcium and lead hydroxyapatite

  • R. M. H. Verbeeck
  • C. J. Lassuyt
  • H. J. M. Heijligers
  • F. C. M. Driessens
  • J. W. G. A. Vrolijk
Article

DOI: 10.1007/BF02409444

Cite this article as:
Verbeeck, R.M.H., Lassuyt, C.J., Heijligers, H.J.M. et al. Calcif Tissue Int (1981) 33: 243. doi:10.1007/BF02409444

Summary

Solid solutions of calcium hydroxyapatite (CaOHA) and lead hydroxyapatite (PbOHA) of the formula Ca10−x Pbx (PO4)6 (OH)2 were prepared by coprecipitation followed by heating at 800°C in a stream of CO2-free water vapor of 1 atm. The samples were apatitic in the range 0<x<6 and contained lead phosphates as a second phase at higher Pb/Ca ratios. Lattice parameters and cation distribution of the apatitic samples were determined by X-ray diffraction. The lattice parameters varied linearly with x in the range considered, whereas all Pb2+ were located in the sixfold position for cations. There was a miscibility gap in the apatite series of solid solutions in the range 1<x<4, whereas apatites in the range 6<x<10 were not stable under the conditions of preparation. It is concluded that apatites in the range 4<x<6 represent a minimum in the free energy of solid solutions between CaOHA and PbOHA.

Key words

Calcium hydroxyapatite Lead hydroxyapatite Cation distribution Lattice parameters Solid solutions 

Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • R. M. H. Verbeeck
    • 1
  • C. J. Lassuyt
    • 1
  • H. J. M. Heijligers
    • 2
  • F. C. M. Driessens
    • 3
  • J. W. G. A. Vrolijk
    • 2
  1. 1.Laboratory for Analytical ChemistryUniversity of GentGentBelgium
  2. 2.Laboratory for Physical ChemistryUniversity of TechnologyEindhovenBelgium
  3. 3.Institute of Dental Materials ScienceCatholic UniversityNijmegenThe Netherlands