The System Ca3(PO4)2–Ca2SiO4: The Sub-System Ca2SiO4–7CaOP2O52SiO2

A study of the sub-system Ca2SiO4–7CaOP2O52SiO2 within the system Ca3(PO4)2–Ca2SiO4 was conducted as a preliminary step toward obtaining new biomaterials with controlled microstructures. Phase composition of the resulting ceramics was studied using X-ray diffraction and scanning electron microscopy with attached wavelength dispersive spectroscopy. The results showed that the sub-system presents an invariant eutectoid point at 518°C ± 6°C with a composition of 31 wt% Ca3(PO4)2 and 69 wt% Ca2SiO4, and typical eutectoid microstructure of lamellae morphology. These results are in disagreement with the previous reported data, which locate the invariant eutectoid point at 500 ± 20°C with a composition of 36.75 wt% Ca3(PO4)2 and 63.25 wt% Ca2SiO4.

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