Synthesis and Phase Stability of Silicate-Substituted α-Tricalcium Phosphate

Abstract:

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Silicate-substituted calcium phosphates have been shown to result in enhanced biological performance compared to the corresponding, silicate-free, calcium phosphates. We have produced a range of silicate-substituted alpha-TCP compositions using two different synthesis methods and two different substitution mechanisms. Single phase compositions were only observed for a silicate substitution of 1.3 wt% by both solid state synthesis and aqueous precipitation synthesis, although the latter was the result of a design composition with a higher silicate substitution (3 wt%). The silicate substitution resulted in small changes in the unit cell parameters of the alpha-TCP. More importantly, this small level of silicate substitution had a strong effect on the thermal stability of the alpha-TCP phase, with the silicate substitution stabilising the alpha-polymorph to lower temperatures. This has an immediate advantage in that the quenching conditions are not as critical for the production of silicate-substituted alpha-TCP compositions compared to silicate-free alpha- TCP.

Info:

Periodical:

Key Engineering Materials (Volumes 361-363)

Main Theme:

Edited by:

Guy Daculsi and Pierre Layrolle

Pages:

67-70

DOI:

10.4028/www.scientific.net/KEM.361-363.67

Citation:

I. Massie et al., "Synthesis and Phase Stability of Silicate-Substituted α-Tricalcium Phosphate", Key Engineering Materials, Vols. 361-363, pp. 67-70, 2008

Online since:

November 2007

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Price:

$35.00

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