1. Correlation between degree of crystallinity and bluing of Zn1–Co Al2O4 (0≤x≤1) nanopowders prepared by soft chemistry route
- Author
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Lahcen Er-Rakho, Bernard Durand, Yann Borjon-Piron, Rachida El Ouatib, Hind Lakhlifi, Youssef El Jabbar, Sophie Guillemet-Fritsch, Université Hassan II [Casablanca] (UH2MC), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Hassan II Mohammedia - Casablanca - UH2MC (MOROCCO), and Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
- Subjects
Ceramics ,Materials science ,Absorption spectroscopy ,Matériaux ,Aluminate ,02 engineering and technology ,[CHIM.INOR]Chemical Sciences/Inorganic chemistry ,engineering.material ,01 natural sciences ,Soft chemistry ,law.invention ,chemistry.chemical_compound ,Crystallinity ,Colorimetric analysis ,law ,Differential thermal analysis ,0103 physical sciences ,Materials Chemistry ,Calcination ,010302 applied physics ,Amorphous phase ,Process Chemistry and Technology ,Spinel ,021001 nanoscience & nanotechnology ,Nanocrystals ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Thermogravimetry ,chemistry ,Chemical engineering ,Ceramics and Composites ,engineering ,Zinc-cobalt aluminate ,0210 nano-technology - Abstract
International audience; 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.
- Published
- 2021