Skip to Main content Skip to Navigation
Journal articles

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

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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [37 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-02976870
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Friday, October 23, 2020 - 4:50:52 PM
Last modification on : Saturday, October 24, 2020 - 3:29:45 AM

File

EL JABBAR _26799.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Youssef El Jabbar, Hind Lakhlifi, Rachida El Ouatib, Lahcen Er-Rakho, Sophie Guillemet, et al.. Structure, microstructure, optical and magnetic properties of cobalt aluminate nanopowders obtained by sol-gel process. Journal of Non-Crystalline Solids, Elsevier, 2020, 542, pp.120115. ⟨10.1016/j.jnoncrysol.2020.120115⟩. ⟨hal-02976870⟩

Share

Metrics

Record views

62

Files downloads

5