Synthesis of nanoparticle zinc phosphate dihydrate by solid state reaction at room temperature and its thermochemical study

摘要

Nanoparticle zinc phosphate dihydrate was prepared by solid-state reaction at ambient temperature from Na_3PO_4 centre dot 12H_2O and ZnSO_4 centre dot 7H_2O, and characterized by X-ray, Raman, FT-IR spectra and TEM. Thermochemical study was performed by a RD496-III microcalorimeter at 298.15 K. The results reveal that the obtained product is Zn_3(PO_4)_2 centre dot 2H_2O with spherical shape and particle size is between 40-50 urn. The standard enthalpy value for above reaction is calculated as -45.793 kJ centre dot mol~(-1). The standard enthalpy of formation for zinc phosphate dihydrate is recommended as -3788.607 kJ centre dot mol~(-1).