Synthesis of CoAl2O4 by double decomposition reaction between LiAlO2 and molten KCoCl3

Noura Ouahdi (1, 2) , Sophie Guillemet (1) , Bernard Durand (1, 2) , Rachida El Ouatib (1, 2) , Lahcen Er-Rakho (2) , R. Moussa (2) , Azzeddine Samdi

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 FSAC - Faculté des Sciences Aïn Chock [Casablanca]

Submicronic CoAl2O4 powders were prepared by double decomposition reaction between solid LiAlO2 and molten KCoCl3 at 500 ◦C for 24 h. The reaction mechanism involves the dissolution of LiAlO2 shifted by the precipitation of CoAl2O4 until complete transformation and the reaction leads to powders with a very homogeneous chemical composition. The powders obtained were mainly characterized by XRD, FTIR, ICP, X.EDS, electron microscopy and diffraction and diffuse reflexion. The blue pigments obtained exhibit a high thermic stability allowing their use for the colouring of ceramic tiles.

Mots clés: Molten salt preparation; Firing; Spectroscopy; Colour; CoAl2O4

Domaines: Matériaux

Noura Ouahdi, Sophie Guillemet, Bernard Durand, Rachida El Ouatib, Lahcen Er-Rakho, et al.. Synthesis of CoAl2O4 by double decomposition reaction between LiAlO2 and molten KCoCl3. Journal of the European Ceramic Society, 2008, 28 (10), pp.1987-1994. ⟨10.1016/j.jeurceramsoc.2007.12.035⟩. ⟨hal-03576714⟩