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Termal decomposition of carbonated calcium phosphate apatites

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Abstract

The thermal stability of AB-type carbonated calcium phosphate apatites prepared by precipitation from aqueous media was studied. The behavior of powders was investigated using temperature programmed XRD, infrared spectroscopy and thermogravimetry. In N2 atmosphere, two successive peaks of decarbonatation with maxima at about 700 and 950°C occurred. This behavior is explained by different substitution modes for carbonates in the apatite. The decarbonatation peaks were shifted to higher temperature under CO2 (around 900 and 1150°C). The analysis of the thermal stability allowed further densification of carbonate apatite ceramics without important carbonate loss.

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Authors and Affiliations

  1. Faculté des Sciences et Techniques, Science des Procédés Céramiques et de Traitements de Surface UMR 6638, 123 Avenue Albert Thomas, 87060, Limoges Cedex, France

    J. P. Lafon, E. Champion & D. Bernache-Assollant

  2. Centre SPIN, PC2M, Ecole Nationale Supérieure des Mines, 158, Cours Fauriel, 42023, Saint-Etienne Cedex 2, France

    R. Gibert & A. M. Danna

Authors
  1. J. P. Lafon
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  2. E. Champion
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  3. D. Bernache-Assollant
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  4. R. Gibert
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  5. A. M. Danna
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Lafon, J.P., Champion, E., Bernache-Assollant, D. et al. Termal decomposition of carbonated calcium phosphate apatites. Journal of Thermal Analysis and Calorimetry 72, 1127–1134 (2003). https://doi.org/10.1023/A:1025036214044

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