In order to obtain phosphate biomaterials, non-conventional wet-chemical methods are generally used. Therefore in this work the spray-pyrolysis method was chosen. For this purpose, calcium nitrate tetrahydrate (Ca (NO3)2·4H2O) and triethyl phosphate (C6H15O4P) were used as raw materials. By optimizing the spray-pyrolysis synthesis parameters, hydroxyapatite (HAp) nanopowders were prepared at different pyrolysis temperatures ranged between 600 and 1000°C.
The thermal behavior of the precursors was investigated by thermal analysis methods (TG- DTG). The HAp nanopowders were characterized from phase composition, chemical and morphological point of view by X-ray diffraction, scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM).
Duo to these techniques, information regarding the effect of the synthesis temperature on the main characteristics of the HAp powders were provided.