Preparation and characterisation of green nano-sized ceramic pigments with the spinel structure AB2O4 (A = Co, Ni and B = Cr, Al)

Inorganic pigments based on AB2O4 (A = Co, Ni; B Cr, Al) spinel structures with green colour were successfully synthesised by the polymeric route. The effect of substitution trivalent and divalent cations structural, optical morphological properties was investigated. nanopowders examined using thermogravimetry-di?erential thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), UV–vis di?use re?ectance measurements, CIEL*a*b* colorimetric analyses. results show that CoCr2O4 spinels substituted nickel aluminium obtained a single phase after heat treatment at 900 °C. produced powders present shades improvement in morphology for samples. Ni0·5Co0·5CrAlO4 nanoparticles consisted grains quasi-spherical shape sizes between 50 75 nm. This powder used small quantities glazes colouring tests surfaces ceramic substrates.