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Influence of the preparation methods on the physico-chemical properties of NixCo3-xO4 (0 ?x ? 2.5) spinel oxides".

Four analytical techniques, i.e. X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), ultraviolet-visible-near infrared reflectance spectroscopy (UV-vis-NIR), X-ray photoelectron spectroscopy (XPS) and four different synthesis methods, i.e the sol gel routes pechini and propionic acid route, thermal decomposition of nitrates and coprecipitation of hydoxides, have been used to characterise Ni – Co mixed oxides NixCo3-xO4 (0 ? x ? 1.2). XRD patterns show that the oxides crystallise in cubic spinel phases with a unit lattice parameter, which increases with x and closely linked to the preparation method. The UV-vis-NIR reflectance patterns confirm the two mixed valence ionic distribution. IR spectra exhibit strong peak characteristics of pure spinel. XPS study shows that there are possibly structural differences as ions site occupation or types of spinel form in compounds prepared by different methods.

Auteur(s) : Mamadou Guèye, Makhtar Guène
Pages : 27 - 36
Année de publication : 2015
Revue : Ghana Journal of Science
N° de volume : 55
Type : Article
Mise en ligne par : GUENE Makhtar