Synthesis and Fabrication of Co1−xNixCr2O4 Chromate Nanoparticles and the Effect of Ni Concentration on Their Bandgap, Structure, and Optical Properties

In the present work, cobalt-chromite-based pigment Co1-xNixCr2O4 chromate powder and nanoparticles with various transition metal concentrations (x = 0.2, 0.4, 0.6, 0.8) were manufactured by applying aqueous synthesis approaches sol–gel routes. XRD analysis of shows that all samples formulated method crystalline a spinel structure. Chromites show green color higher nickel concentration, while Co-substituent blackish pigments. Samples annealed at distinct temperatures ranging from 600 °C to 750 °C. The obtained characterized X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy (RS), photoluminescence (PL), energy-dispersive (EDS). particle size parent compound (CoCr2O4) ranges 100 nm 500 nm, as measured SEM. tendency particles form aggregates increasing annealing temperature was observed. These compounds may be successfully used an effective doped nickel-cobalt ceramic pigment.