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Issue 3, 2009
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The structure of strontium-doped hydroxyapatite: an experimental and theoretical study

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Abstract

First-principles modeling combined with experimental methods were used to study hydroxyapatite in which Sr2+ is substituted for Ca2+. Detailed analyses of cation–oxygen bond distributions, cationcation distances, and site 1–oxygen polyhedron twist angles were made in order to provide an atomic-scale interpretation of the observed structural modifications. Density functional theory periodic band-structure calculations indicate that the Ca2+ to Sr2+ substitution induces strong local distortion on the hydroxyapatite lattice: the nearest neighbor Sr–O bond structures in both cationic sites are comparable to pure SrHA, while Sr induces more distortion at site 2 than site 1. Infrared vibrational spectroscopy (FTIR) and extended X-ray absorption fine structure (EXAFS) analysis suggest increasing lattice disorder and loss of OH with increasing Sr content. Rietveld refinement of synchrotron X-ray diffraction patterns shows a preference for the Ca1 site at Sr concentrations below 1 at.%. The ideal statistical occupancy ratio Sr2/Sr1 = 1.5 is achieved for ∼5 at.%; for higher Sr concentrations occupation of the Ca2 site is progressively preferred.

Graphical abstract: The structure of strontium-doped hydroxyapatite: an experimental and theoretical study

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Publication details

The article was received on 19 Feb 2008, accepted on 11 Sep 2008 and first published on 05 Nov 2008


Article type: Paper
DOI: 10.1039/B802841A
Citation: Phys. Chem. Chem. Phys., 2009,11, 568-577
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    The structure of strontium-doped hydroxyapatite: an experimental and theoretical study

    J. Terra, E. R. Dourado, J. Eon, D. E. Ellis, G. Gonzalez and A. M. Rossi, Phys. Chem. Chem. Phys., 2009, 11, 568
    DOI: 10.1039/B802841A

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