L Torkian - Department of applied chemistry, Islamic Azad University, South Branch, Tehran, Iran
H Bakhtiari - Department of applied chemistry, Islamic Azad University, South and North Branches, Tehran, Iran

The aim of this work consists of synthesis of nanocrystalline single-phase CoAl2O4 powders from comparatively less expensive raw materials and a simple method. Nanosized ceramic pigments of cobalt aluminate were obtained from a mixture of cobalt nitrate, aluminum nitrate and citric acid (or sucrose) as a chelating agent. Single-phase nanocrystalline CoAl2O4 was prepared by thermal decomposition of the polymeric precursor and the calcining temperature was about 800˙C .Structure and properties of CoAl2O4 nanoparticles and also the effects of the chelating agents, were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods.

CoAl2O4; ceramic pigment; metal organic precursor; metal oxides; nanopigments