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

El Jabbar, Youssef and Lakhlifi, Hind and El Ouatib, Rachida and Er-Rakho, Lahcen and Guillemet, Sophie and Borjon-Piron, Yann and Durand, Bernard Correlation between degree of crystallinity and bluing of Zn1–Co Al2O4 (0≤x≤1) nanopowders prepared by soft chemistry route. (2021) Ceramics International, 47 (11). 16269-16275. ISSN 0272-8842

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Official URL: https://doi.org/10.1016/j.ceramint.2021.02.205

Abstract

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 synthesised 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.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Université Hassan II Mohammedia - Casablanca - UH2MC (MOROCCO)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:02 Feb 2022 15:32

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