Phase evolution during the low temperature formation of stoichiometric hydroxyapatite-gypsum composites

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3 Citations (Scopus)


Both plaster of Paris (CaSO4·(1/2)H2O, POP) and bone-like synthetic calcium phosphates (CaP) have been used as bone-like cements. The current study investigated the formation of composites involving POP with each of three types of stoichiometric hydroxyapatites (abbreviated as SHAp, S-SH, and C-SH, each with a Ca/P molar ratio of 1.67). The kinetics, variations in solution chemistry during the formation of these composites and phase compositions of the formed products were investigated over a course of 24 h. Although the presence of gypsum precursors was shown to decrease the alkalinity of the medium involving SHAp formation from its precursors, a delay in the growth kinetics of gypsum was observed. The same behavior was observed in the presence of commercial apatite (C-SH), whereas in the presence of synthetic apatite (S-SH), no delay was observed. A possibility of formation of a calcium sulfate phosphate double salt, as an intermediate, was investigated and confirmed by XRD analysis.

Original languageEnglish
Pages (from-to)715-723
Number of pages9
JournalCeramics International
Issue number3
Publication statusPublished - Apr 2011


  • Gypsum
  • Isothermal calorimetry
  • Microstructure
  • Phase composition
  • Stoichiometric hydroxyapatite

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry


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