TY - JOUR
T1 - Characteristics of synthetic hydroxyapatites and attempts to improve their thermal stability
AU - Tampieri, A.
AU - Celotti, G.
AU - Sprio, S.
AU - Mingazzini, C.
PY - 2000/3/31
Y1 - 2000/3/31
N2 - 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.
AB - 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.
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U2 - 10.1016/S0254-0584(99)00252-7
DO - 10.1016/S0254-0584(99)00252-7
M3 - Article
AN - SCOPUS:0033903067
SN - 0254-0584
VL - 64
SP - 54
EP - 61
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
IS - 1
ER -