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Structure, microstructure, optical and magnetic properties of cobalt aluminate nanopowders obtained by sol-gel process

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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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
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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