Sonochemical Synthesis of Zn_3(PO_4)_(2.4)H_2O and Zn_3(PO_4)_2 Powders

摘要

Zn_3(PO_4)_(2.4)H_2O, which is an important component of biomedical zinc phosphate cement, was synthesized from an aqueous solution of zinc oxide and orthophosphoric acid by the sonochemical method. This synthesis method yielded best results with respect to high purity and crystallinity. Structural characteristics of the compound were investigated by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and scanning electron microscopy (SEM). FT-IR spectra indicated the presences of different crystallographic (PO_4)~(3-) ion and H_2O molecules for the Zn_3(PO_4)_(2.4)H_2O and Zn_3(PO_4)_2 structures. The resulting XRD patterns showed the purity phases of orthorhombic Zn_3(PO_4)_(2.4)H_2O and the monoclinic for its final decomposed Zn_3(PO_4)_2 product. The thermal stability, crystallite size, and plate-like microparticles of Zn_3(PO_4)_(2.4)H_2O and Zn_3(PO_4)_2 are different in this work from those in previous reports, which may be caused by the starting reagents and reaction condition for the sonochemical method.