Characteristics of synthetic hydroxyapatites and attempts to improve their thermal stability

A. Tampieri, G. Celotti, S. Sprio, C. Mingazzini

Research output: Contribution to journalArticlepeer-review

61 Scopus citations


Synthetic hydroxyapatites (HA) with widely different crystallinity degrees were prepared starting from calcium hydroxide and phosphoric acid. The powders were carefully characterized by various physico-chemical techniques. Additions of Ca(OH)2 were performed in order to improve HA thermal stability to firing treatments up to temperatures significantly higher than those commonly employed for safe HA sintering. A positive effect in this sense was found, yielding HA almost pure samples up to 1400-1450 °C and maintaining considerable HA concentrations up to 1600 °C. An explanation in terms of stoichiometric defectiveness, linked to the quantitatively estimated contemporary presence of HPO4 2- and CO3 2- substituting PO4 3- and OH-, was attempted.

Original languageEnglish (US)
Pages (from-to)54-61
Number of pages8
JournalMaterials Chemistry and Physics
Issue number1
StatePublished - Mar 31 2000

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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