Characteristics of synthetic hydroxyapatites and attempts to improve their thermal stability

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

doi:10.1016/S0254-0584(99)00252-7

Characteristics of synthetic hydroxyapatites and attempts to improve their thermal stability

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

Houston Methodist

Research output: Contribution to journal › Article › peer-review

64 Scopus citations

Abstract

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 language	English (US)
Pages (from-to)	54-61
Number of pages	8
Journal	Materials Chemistry and Physics
Volume	64
Issue number	1
DOIs	https://doi.org/10.1016/S0254-0584(99)00252-7
State	Published - Mar 31 2000

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

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abstract = "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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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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AN - SCOPUS:0033903067

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JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

IS - 1

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Characteristics of synthetic hydroxyapatites and attempts to improve their thermal stability

Abstract

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