Phase transition of synthesizing tetracalcium phosphate in a solid-state reaction

The phase transition course of synthesizing tetracalcium phosphate in a solid-state reaction was investigated by TGA-DSC, XRD and FTIR. The results show that the phase transformations occurring over 1200°C are consistence with the high temperature phase diagram of CaO-P₂O₅-H₂O. In view of lack of the low temperature phase diagram, the phase transitions below 1200°C can offer significant data to draw it; understanding the whole course of phase evolution contributes to optimum the synthesizing process to get pure TTCP, the most important biomaterial in the field of calcium phosphate cement.