Calcium phosphate powders have been synthesized using wet-chemical precipitation method from CaCO₃ and H₃PO₄ as starting materials. Influence of technological parameters (ending pH value of calcium phosphate suspension and calcination temperature) on phase composition of final product – calcium phosphates was investigated.

The identification and phase analysis of as-synthesized and calcined calcium phosphates were investigated with X-ray diffraction and FTIR.

X-ray diffraction patterns of as-synthesized calcium phosphates showed that all powders were partially crystalline. All as-prepared calcium phosphate powders consisted of single phase - HAp as indicated by XRD.

XRD patterns of calcium phosphate samples calcined at 1000°C and above showed different phase composition (HAp, β-TCP, HAp/ β-TCP) in depending of ending pH value of calcium phosphate suspension.

The phase analysis of technologically modified calcium phosphate syntheses are shown in Fig. 1. The calcium phosphate sample (1) synthesized at pH=9 shows that the product consists of a single well crystallized phase – hydroxyapatite, sample (2) synthesized at pH=6 shows that this sample is a biphasic mixture of hydroxyapatite and β-tricalcium phosphate (β-TCP), sample (3) synthesized at pH=7 is the pure phase of β-TCP.

Fig. 1. X-ray diffraction patterns of calcium phosphates syntheses obtained at different pH values in the range of 6-11 and calcined at 1000°C for 1 h.

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