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- Title
Structural analysis and thermochemistry of 'A' type phosphostrontium carbonate hydroxyapatites.
- Authors
Jebri, Sonia; Boughzala, Habib; Bechrifa, Ali; Jemal, Mohamed
- Abstract
'A' type phosphostrontium carbonate hydroxyapatites, having the general formula Sr(PO)(OH)(CO) 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.
- Subjects
STRUCTURAL analysis (Engineering); THERMOCHEMISTRY; STRONTIUM compounds; APATITE; CARBONATES; SOLID rare gases; CHEMICAL reactions
- Publication
Journal of Thermal Analysis & Calorimetry, 2012, Vol 107, Issue 3, p963
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-011-1598-2