Solid‐State Compatibility in Two Regions of the System ZnO–CaO–P2O5

Abstract

Solid‐state compatibilities in the rich tricalcium phosphate and rich zinc oxide regions of ZnO–CaO–P2O5 ternary system were established through experimental studies. These are of special interest: the tricalcium phosphate region, for further bioceramic applications, and the zinc oxide region for applications related to other fields. The objectives of this work were to establish the effect of zinc oxide on stability, phase transitions, and microstructure; therefore different compositions ranging from 0.96% to 84% mol of ZnO were thermal treated and quenched at 900°C. The crystalline phases and the microstructures were analyzed using X‐ray Diffraction (XRD) and Field‐Emission Scanning Electron Microscopy with Energy‐Dispersive Spectroscopy (FE‐SEM EDS). Moreover, refinement technique of lattice parameters using the FullProf 2k program and its graphical interface WinPLOTR enabled to establish the solid solution range of Zn2+ in β‐Ca3(PO4)2 on line joining Ca3(PO4)2–ZnO. The results allowed to determine four compatibility triangles: ZnO–Zn3(PO4)2–Zn2Ca(PO4)2, ZnO–Zn2Ca(PO4)2–Ca3(PO4)2, ZnO–Ca3(PO4)2–HAp, ZnO–HAp–CaO, and the three phase fields Zn3(PO4)2–ZnO, Ca3(PO4)2–HAp, and Ca3(PO4)2–ZnO in the system.