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Article Dans Une Revue Ceramics International Année : 2021

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

Résumé

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 the optical properties under the effect of the calcination temperature was investigated. The synthesized powders were characterized by means of X-ray diffraction (XRD), Thermogravimetry and Differential thermal analysis (TG–DTA), field emission scanning electron microscopy (FE-SEM), Brunauer–Emmett–Teller analysis (BET), UV–Vis absorption spectroscopy analysis and colorimetric analysis (CIELab). A single-phase Zn1–xCoxAl2O4 (0≤x≤1) spinel was formed at an annealing temperature of 700°C. Structural refinement via the Rietveld method shows that an annealing temperature in excess of 700°C leads to a decrease in the amorphous phase rate. At 800 °C, the enrichment in 50% of cobalt leads to blue powders with a degree of crystallinity of approximately 92% and a quasi-spherical morphology of nanometric size less than 100 nm.
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hal-03391732 , version 1 (21-10-2021)

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Youssef El Jabbar, Hind Lakhlifi, Rachida El Ouatib, Lahcen Er-Rakho, Sophie Guillemet-Fritsch, et al.. Correlation between degree of crystallinity and bluing of Zn1–Co Al2O4 (0≤x≤1) nanopowders prepared by soft chemistry route. Ceramics International, 2021, 47 (11), pp.16269 - 16275. ⟨10.1016/j.ceramint.2021.02.205⟩. ⟨hal-03391732⟩
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