Parallelogram-like microparticles of calcium dihydrogen phosphate monohydrate (Ca(H2PO4)2·H2O) obtained by a rapid precipitation route in aqueous and acetone media

Calcium dihydrogenphosphate monohydrate (Ca(H2PO4)2·H2O) was prepared by a rapid and simple precipitation method using CaCO3 and H3PO4 in aqueous and acetone media at ambient temperature. The thermal transformation of the synthesized Ca(H2PO4)2·H2O at 500 °C was obtained to be CaP2O6 occurred through the dehydration and the phosphate condensation reactions, as revealed by thermoanalytical techniques (TG/DTG/DTA). The synthesized Ca(H2PO4)2·H2O and its decomposition product CaP2O6 were characterized by X-ray powder diffraction (XRD), Fourier transfer infrared (FTIR) spectroscopy and scanning electron microscope (SEM). Thermal behavior and the morphology of the synthesized Ca(H2PO4)2·H2O in aqueous and acetone media are compared with those of other works. The SEM micrograph of Ca(H2PO4)2·H2O show parallelogram-like microparticles containing small and large grain sizes. The aqueous and acetone media are proposed to play an important role in the synthetic process of calcium phosphates in exhibiting different physical properties, which are important for specific applications.