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Structural analysis and thermochemistry of “A” type phosphostrontium carbonate hydroxyapatites

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Abstract

“A” type phosphostrontium carbonate hydroxyapatites, having the general formula Sr10(PO4)6(OH)(2−2x)(CO3) x with 0 ≤ x ≤ 1, were synthesised by solid gas reaction at high temperature. The samples were characterised by X-ray diffraction and infrared spectroscopy. Analysis of carbonate was achieved by coulometry and Rietveld refinement of the structure. Using an isoperibol calorimeter, the heat of solution of these products was measured at 298 K in 9 wt% nitric acid solution. Thermochemical cycle was proposed and complementary experiences were performed to reach the standard enthalpies of formation of these compounds. The results showed a decrease of the enthalpy of formation with the amount of carbonate introduced in the lattice, suggesting an increase of stability due to this kind of substitution.

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Authors and Affiliations

  1. Faculty of Science, Chemistry Department, Applied Thermodynamic Laboratory, Tunis El Manar University, Tunis, 2092, Tunisia

    Sonia Jebri, Ali Bechrifa & Mohamed Jemal

  2. Faculty of Science, Chemistry Department, Laboratory of Crystallochemistry and materials, Tunis El Manar University, Tunis, 2092, Tunisia

    Habib Boughzala

Authors
  1. Sonia Jebri
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  2. Habib Boughzala
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  3. Ali Bechrifa
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  4. Mohamed Jemal
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Correspondence to Ali Bechrifa.

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Jebri, S., Boughzala, H., Bechrifa, A. et al. Structural analysis and thermochemistry of “A” type phosphostrontium carbonate hydroxyapatites. J Therm Anal Calorim 107, 963–972 (2012). https://doi.org/10.1007/s10973-011-1598-2

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  • DOI: https://doi.org/10.1007/s10973-011-1598-2

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