Black pigments based on Fe, Cr and Co were synthesized by the polymeric precursor method. The thermal treatment effects were analyzed on color development and stability of pigment. The optimized pigment composition results from the Fe0.7Cr1.3O3 and CoCr2O4 mixture, with appropriately development of coloration at 1000 °C/2 h. After thermal treatment at different temperatures, structural, morphologic and colorimetric aspects of the materials were characterized. By using X-ray diffraction, the crystalline evolution of the pigment was determined. Through scanning electron microscopy the powders morphology was observed. Determination of the specific surface area of powders was done by adsorption of nitrogen using the BET method. In the colorimetric analysis, the powders colors and the visible spectroscopy absorption were discussed.
spinels; chromite; black pigments; Pechini
