Effect of solvents on the microstructure of CaWO4 prepared by a solvothermal synthesis

摘要

Different sizes of nanostructured CaWO4 have been prepared by a simple solvothermal synthesis at a low temperature of 160 °C for 6h through the reaction between Ca(NO3)2·4H2O and Na2WO4·2H2O using various solvents as the reaction medium. The products, characterized by X-ray diffraction (XRD), were specified as pure CaWO4 with the scheelite structure. Scanning electron microscope (SEM) and transmission electron microscope (TEM) analysis showed that the particle sizes are mainly related to the physical and chemical properties of the solvents used in the solvothermal synthesis. Photoluminescence properties were also investigated.