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Abstract: CaMoO4 nanoparticles were successfully synthesized by a molten salt method at a temperature as low as 270°C. The as-prepared powders, characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), exhibited a pure CaMoO4 phase about 70nm in particle size and uniform nearly-spherical particle shape. The room temperature luminescent spectra were performed on a Fluorolog-3 spectrofluorometer; the powders exhibited green emission peaks of 508nm. The molten salt medium could speed up the diffusion rates of the reaction ions, and thus decrease greatly the synthesis temperature of CaMoO4 nanoparticles. [Copyright &y& Elsevier]

Abstract: CaWO4 nanoparticles were synthesized by a molten salt method at a low temperature as 200 °C. The as-prepared powders were characterized by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM), and exhibited a pure tetragonal phase CaWO4 with a scheelite structure about 20 nm in size with uniform and nearly spherical or elongated grain shape. The molten salt medium could speed up the diffusing rates of the reaction ions, and thus decrease greatly the synthetic temperature of CaWO4 nanoparticles. It is rational to expect that some other nanoscale materials, which easily vaporize at high temperature, may be synthesized by this method. [Copyright &y& Elsevier]