The role of the counter-ions present in syntheses on the thermal stabilization of strontium and/or calcium apatites - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Materials Science and Engineering: B Année : 2015

The role of the counter-ions present in syntheses on the thermal stabilization of strontium and/or calcium apatites

Leila da Silva
  • Fonction : Auteur
Daniela dos Santos Menezes
  • Fonction : Auteur
Luis Almeida
Joseph Dentzer
  • Fonction : Auteur
Euler dos Santos
  • Fonction : Auteur

Résumé

Abstract The goal of this work was to study the thermal stabilization of calcium apatites in which the Ca2+ ions were substituted for Sr2+ in increasing concentrations via ionic co-substitutions. Two distinct standard syntheses were proposed for comparative purposes: one using counter-ions that were not easily incorporated into the apatite structure (NH4+/NO3−) and one using counter-ions that can be easily incorporated into the structure (Na+/Cl−). After calcination, only the apatites synthesized in the presence of NH4+/NO3− presented phase transformation. In contrast, the apatites synthesized in the presence of Na+/Cl− formed a solid solution after calcination, with Na+, Ca2+, Sr2+ and Cl− sharing the same apatite lattice. Wavelength dispersive X-ray fluorescence spectroscopy (WDXRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and temperature-programmed desorption (TPD) techniques showed that the counter-ions present during the syntheses that are associated with CO32− play an important role in the thermal stabilization of the apatites.

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Dates et versions

hal-02584352 , version 1 (14-05-2020)

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Leila da Silva, Daniela dos Santos Menezes, Luis Almeida, Karine Anselme, Joseph Dentzer, et al.. The role of the counter-ions present in syntheses on the thermal stabilization of strontium and/or calcium apatites. Materials Science and Engineering: B, 2015, 199, pp.77-86. ⟨10.1016/j.mseb.2015.05.003⟩. ⟨hal-02584352⟩
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