Solid-State Synthesis, Optimization of Reaction Parameters and Physical Properties of CoAl2O4 Spinel Nanomaterials

Document Type : Research Article


1 Department of Basic Science, Jundi-Shapur University of Technology, Dezful, I.R. IRAN

2 Department of Inorganic Chemistry, Faculty of Chemistry, Semnan University, Semnan, I.R. IRAN


Synthesis of nanostructured CoAl2O4 particles was performed successfully by a one-step < /em> solid-state method using CoCl2, AlCl3, and Al(NO3)3.9H2O raw materials at stoichiometric 1:2 Co:Al molar ratio. The reactions were performed at 700, 800, and 900 ᵒC for 10 h. The synthesized materials were characterized by Powder X-Ray Diffraction (PXRD) technique. The results showed that the patterns had a main CoAl2O4 structure with a space group and the lattice parameter of a=b=c=8.1005 Å. The PXRD data revealed that increasing the reaction temperature to 900 ºC decreased the crystallite size of the target. FESEM images showed that the synthesized CoAl2O4 particles had mono-shaped sphere morphologies. The data indicated that when aluminum nitrate was used as the raw material, a light blue color was obtained. So, in the synthesis of the cobalt aluminate materials, changing the reaction temperature and raw material type affect considerably the color of the synthesized material. UltraViolet-Visible spectrum analysis showed that the nanostructured BaCeO3 powders possessed strong light absorption properties in the ultraviolet-visible light region. The direct optical band gaps were in the ranges 1.82 - 1.87 eV.


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