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Determination of the Ca/P ratio in calcium-deficient hydroxyapatite using X-ray diffraction analysis

  • K. Ishikawa
  • P. Ducheyne
  • S. Radin
Papers

The determination of the calcium to phosphate ratio (Ca/P) in Ca-deficient hydroxyapatite [d-HAP; Ca10−x(HPO4) x (PO4)6−x(OH)2−x] using X-ray diffraction analysis (XRD) is reported. At temperatures above 700°C HPO42- groups are transformed to PO43- groups, thereby producing β-tricalcium phosphate [β-TCP; Ca3(PO4)2]. Thus, the deviation from stoichiometry, x, can be calculated from the mass fraction of β-TCP, which in turn can be determined from quantitative XRD analyses. In this study d-HAP powders with various Ca/P ratios were prepared following several procedures. It is shown that the Ca/P ratio determined by quantitative XRD correlates well with that measured by chemical analyses.

Keywords

Polymer Calcium Phosphate Chemical Analysis Mass Fraction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1993

Authors and Affiliations

  • K. Ishikawa
    • 1
  • P. Ducheyne
    • 1
  • S. Radin
    • 1
  1. 1.Department of BioengineeringUniversity of PennsylvaniaPhiladelphiaUSA

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