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Synthesis, X-ray diffraction and solid-state 31P magic angle spinning NMR study of α-tricalcium orthophosphate

  • M. Bohner
  • J. LeMaître
  • A. P. LeGrand
  • J.-B. D'Espinose de la Caillerie
  • P. Belgrand
Article

Abstract

The effects of synthesis conditions on the quantitative preparation of α-tricalcium phosphate (α-TCP) have been investigated. The following parameters of the synthesis were considered: nature of the starting material-Ca-deficient hydroxyapatite, DAP, versus hydroxyapatite-anhydrous dicalcium phosphate mixtures (HAP-DCPA); Ca/P atomic ratio of the mixture, calcination temperature and time, and cooling rate. The yield and crystallinity of the final product have been estimated using X-ray diffraction (XRD) and solid state 31P magic angle spinning NMR (MAS-NMR) techniques. The results show that pure, well-crystallized α-TCP powders exhibiting nearly ideal MAS-NMR spectra, can be obtained by reactive sintering of HAP-DCPA (Ca/P=1.50...1.52) mixtures, at 1400°C for 8 h. The broadening of MAS-NMR spectra can be used as an indicator of structural order in the final product. The α-TCP yield with DAP was always less than 50%.

Keywords

Cool Rate Calcination Hydroxyapatite Calcination Temperature Atomic Ratio 
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 1996

Authors and Affiliations

  • M. Bohner
    • 1
  • J. LeMaître
    • 1
  • A. P. LeGrand
    • 2
  • J.-B. D'Espinose de la Caillerie
    • 2
  • P. Belgrand
    • 2
  1. 1.Laboratoire de Technologie des PoudresEcole Polytechnique Fédérale de LausanneLausanneSwizerland
  2. 2.Laboratoire de Physique QuantiqueCNRS URA 1428, ESPCIParis CEDEX 05France

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