Abstract
In this work, we investigated the effect of heat treatment on the structural and optical behavior of NiWO4 crystals synthesized by coprecipitation followed by the hydrothermal method, with post-treatment at different temperatures., Rietveld refinement and Raman spectra indicate that NiWO4 crystals have a wolframite-like monoclinic structure with a space group (P2/c) and a symmetry point group (C2h4). A preferential growth in the (011) planes was observed at 500 °C, confirmed by XRD, theoretical and documented, thus, crimped on the y-axis of partials (W) tung event sequences for modeling unit cells/crystals in this temperature range in TGA and DSC. In Raman spectroscopy, the NiWO4 spectrum gradually changed in the spectra from its nanometer character and became a bulk material. The Egap values showed a tendency of reduction with increasing heat treatment up to 500 °C (2.75 eV), increasing from there. Such alterations being confirmed in the colorimetric analysis, where from the temperature of 500 °C/2 h the material acquired the yellow color and it becomes intended.
Published Version
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