Correlation between degree of crystallinity and bluing of Zn1–Co Al2O4 (0?x?1) nanopowders prepared by soft chemistry route

In this article, we report a facile precursor pyrolysis by sol-gel method to prepare spinel-type Cobalt-substituted zinc aluminate nanoparticles (Zn1–xCoxAl2O4, 0 ? x 1). The relationship between the degree of crystallinity and optical properties under effect calcination temperature was investigated. synthesised powders were characterized means X-ray diffraction (XRD), Thermogravimetry Differential thermal analysis (TG–DTA), field emission scanning electron microscopy (FE-SEM), Brunauer–Emmett–Teller (BET), UV–Vis absorption spectroscopy colorimetric (CIELab). A single-phase Zn1–xCoxAl2O4 (0 1) spinel formed at an annealing 700 °C. Structural refinement via Rietveld shows that in excess °C leads decrease amorphous phase rate. At 800 °C, enrichment 50% cobalt blue with approximately 92% quasi-spherical morphology nanometric size less than 100 nm.