El Jabbar, Youssef and Lakhlifi, Hind and El Ouatib, Rachida and Er-Rakho, Lahcen and Guillemet, Sophie and Durand, Bernard
Structure, microstructure, optical and magnetic properties of cobalt aluminate nanopowders obtained by sol-gel process.
(2020)
Journal of Non-Crystalline Solids, 542. 120115. ISSN 0022-3093
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(Document in English)
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Official URL: https://doi.org/10.1016/j.jnoncrysol.2020.120115
Abstract
The aim of this study was to detennine the effect of different complexing agents and of the annealing temperature on the structural, morphological and optical properties of the synthesized precursors. Thus, cobalt aluminate nanoparticles were prepared by the sol-gel method using polyacrylic acid, glycine or citric acid as complexing agents. The synthesis performed at 500°C for 5 hours led to dark green powders composed of solid solutions denoted Co2+ [Agci-x)Co????;i]O4 and of amorphous alumina (39.8wt%). Calcination at temperatures above 900°C caused the powder colour to change from dark green to blue. A direct spinel structure Co2+ [Al????+] 04 is all the more achieved as the annealing temperature is high. The powder obtained using polyacrylic acid as the complexing agent at 900°C for 5 hours revealed the best morphology; it consisted of agglomerates of primary particles with a quasi- spherical shape and a size in the range 20-40 nm.
Item Type: | Article |
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HAL Id: | hal-02976870 |
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 Casablanca - UH2C (MOROCCO) Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE) |
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Deposited On: | 23 Oct 2020 12:49 |
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