Synthesis of Ceramic Pigments ACr 2 O 4 Using the Non-Conventional Method of Co-Precipitation Assisted by Ultrasound and High Energy Milling

Abstract

In this research ceramic pigments have been synthesized with crystalline spinel structure and chromium based with a stoichiometry ACr 2 O 4 . A was an element with +2 valence metal, in this case, metals were zinc and iron, these pigments have been synthesized by non-conventional methods like the co-precipitation assisted by ultrasound and high milling energy. Pigments were characte-rized by X-ray diffraction (XRD), scanning electron microscopy (SEM), spectrophotometry, and colorimetric CIELab method. Results showed that it was possible to obtain a crystallin desired structure at temperatures below 900˚C by non-conventional methods. These results showed the advantages of ceramic pigments obtained by alternative routes, because it was possible to have a better control over stoichiometry and colorimetric structure properties. Furthermore, they were obtained at temperatures lower than those used by the traditional ceramic route.