Abstract
A state of art molten salt method has been introduced to synthesise ZnWO4 nano-powders, employing ZnCl2 and Na2WO4·2H2O as raw materials. The newly introduced eutectic composition of LiNO3-KNO3 with the melting point temperature of 125°C was employed as salt media. It has been observed that the displacement reaction ZnCl2 + Na2WO4·2H2O → ZnWO4+2NaCl+2H2O was conducted in molten salt media during the synthesis. Characterisation of as-synthesised powders was performed using X-ray diffraction (XRD), Fourier transformation infrared (FTIR) spectroscopy, Brunner–Emmett–Teller (BET), transition electron microscopy (TEM), and photoluminescence (PL). The results showed that temperature had a crucial effect on the crystallite size of synthesised nano-powders. Furthermore, TEM micrographs demonstrated that the synthesised nanoparticles at 350°C were almost angularly shaped with grain size less than 80 nm. In addition, the average activation energy of crystallites growth during synthesis was found to be about 2.47 kJ mol− 1; proposing that the crystallite growth during the synthesis procedure occurred by means of an interfacial reaction.
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