Phase Evolution of Thermally Treated Amorphous Tricalcium Phosphate Nanoparticles
X-ray amorphous tricalcium-phosphate nanoparticles (ATCP) produced by flame spray synthesis were heat-treated at temperatures between 500 and 1000 °C and analyzed in situ by X-ray powder diffraction. The main phase occurring after crystallisation at 525 °C was α-TCP, minor phases were identified as β-TCP and hydroxyapatite. More elevated temperatures induced crystallite growth and the transformation of α-TCP into β-TCP. Above 900 °C no α-TCP was traceable anymore. α’-TCP was not observed in the experiment. This study shows that nanoparticulate α-TCP can be obtained by thermal treatment of an amorphous TCP nanoparticle in a temperature range where sintering effects such as particle growth and densification are moderate or nearly negligible.
Marcelo Prado and Cecília Zavaglia
N. Döbelin et al., "Phase Evolution of Thermally Treated Amorphous Tricalcium Phosphate Nanoparticles", Key Engineering Materials, Vols. 396-398, pp. 595-598, 2009