Study of structural and morphological characteristics of powders of NiO synthesized by combustion reaction and by the Pechini method

In order to improve the characteristics of powders, chemical methods have been widely investigated in recent years, since it allows the synthesis of ceramic powders with precise control of stoichiometry, good sinterability and control of particle size and morphology of the powders. In this context, this work presents the study of the synthesis by combustion and Pechini method to obtain nanoparticles of NiO, and evaluated the influence of synthesis method on the final characteristics of the powder. The powders were characterized by X-ray diffraction, scanning electron microscopy and nitrogen adsorption. The XRD powders by Pechini method showed monophasic, whereas the synthesis of combustion reaction, the dust features, in addition to NiO, Ni metal phase as spurious. The crystallite sizes were 38-43 nm by Pechini and combustion reaction respectively. The sizes of surface area were of 6:44 m² /g by the Pechini method and 1.11 m² /g by combustion. Two synthesis methods were effective in obtaining nanoparticles of NiO. (author)