B. Mihailova et al., Vibration spectroscopy study of hydrolyzed precursors for sintering calcium phosphate bio-ceramics, J MATER SCI, 36(17), 2001, pp. 4291-4297
Diffuse reflectance infrared Fourier transform and Raman spectroscopy is ap
plied to investigate the structure of hydrolyzed CaHPO4 . 2H(2)O (DCPD) pro
cessed to non-stoichiometric apatite to be used as starting material for pr
eparing sintered calcium phosphate materials. The spectra of hydrolyzed DCP
D samples, obtained under differing experimental conditions, are analyzed t
o check how the sintered phase composition correlates with the structure of
the hydrolyzed precursor. It is shown that the addition of extra Ca2+ ions
in the alkaline solution during the process of hydrolyzing affects strongl
y the degree of disorder in the structure of the hydrolyzed materials, thus
increasing the relative amount of hydroxyapatite in the final sintered pro
duct. The addition of F- ions to the synthesis mixture strengthens slightly
the P-O bonds in the precursors and increases the content of hydroxyapatit
e phase in the sintered material. As a result bi-phase ceramics of highest
content of hydroxyapatite can be produced using both fluorine additives and
calcium compensators in the synthesis suspension. (C) 2001 Kluwer Academic
Publishers.