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Related Experiment Videos

Rietveld structure refinement of precipitated carbonate apatite using neutron diffraction data.

Rory M Wilson1, James C Elliott, Stephanie E P Dowker

  • 1Dental Biophysics, Medical Sciences Building, Queen Mary, University of London, Mile End Road, London, UK E1 4NS. r.m.wilson@qmul.ac.uk

Biomaterials
|January 27, 2004
PubMed
Summary

This study reveals how carbonate ions integrate into sodium-containing carbonate apatite structures. The findings clarify carbonate substitution in apatite, crucial for understanding biominerals like bone and teeth.

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Area of Science:

  • Materials Science
  • Crystallography
  • Biomineralization

Background:

  • Carbonate apatites are crucial biominerals found in bone and teeth.
  • Understanding carbonate substitution in apatite is key to their structural and functional properties.

Purpose of the Study:

  • To elucidate the structural incorporation of carbonate ions into sodium-containing carbonate apatite.
  • To refine crystallographic models for carbonate apatite using advanced diffraction techniques.

Main Methods:

  • Collected X-ray and neutron diffraction data, FTIR, MAS-NMR, ICP-AES, and carbonate analyses.
  • Applied Rietveld refinement to fit structural models with explicitly modeled carbonate ions.
  • Investigated structural models of carbonate substitution within the apatite lattice.

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Main Results:

  • Identified carbonate ions substituting for phosphate ions, causing reduced tetrahedral volume.
  • Determined the preferred orientation and disorder of carbonate ions within vacant phosphate sites.
  • Discovered a novel atomic site near the unit cell origin, potentially a water molecule.
  • Refined hexagonal unit cell parameters: a=9.3446(3)Å, c=6.9199(4)Å.

Conclusions:

  • The study provides a detailed structural model for sodium-containing carbonate apatite.
  • The findings are consistent with previous spectroscopic studies on related materials.
  • The precise structural location of carbonate ions offers insights into apatite formation and stability.