Abstract
Cobalt-aluminate spinel, CoAl 2O 4, has been synthesized by two synthesis variants of the complexation method: tartarate and gluconate routes. The complex precursors have been characterized by IR, UV–vis spectroscopy and thermal analysis. The cobalt-aluminate spinel has been investigated by XRD, IR, UV–vis and luminescence spectroscopy and TEM. The results indicated that in both cases the single-phase nanocrystalline CoAl 2O 4 spinel was formed. The average crystallite size from TEM images was in the range 50–60 nm. The emission spectra of CoAl 2O 4 in the visible region confirmed the presence of tetrahedral coordinated Co 2+ ion.
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