A physicochemical study of the structure, composition, and properties of hydroxylapatite modified by silicate ions

By deposition from the simulated body fluid solution hydroxylapatite and silicon-substituted hydroxylapatite samples are synthesized. The structure, properties, and phase composition of the obtained compounds are analyzed by a complex of physicochemical methods (powder X-ray diffraction, IR Fourier spectroscopy, TGA, etc.). It is found that during the deposition of the solid phase silicate ions partially substitute for phosphate ions in the structure of hydroxylapatite. The thermal stability and bioresorbility of modified calcium phosphates are studied. The conclusion is drawn that with an increase in the fraction of silicate ions in the structure of silicon-containing apatite an increase in the thermal stability and bioresorbility is observed.