STUDING SYNTHESIS ZnAl2O4 NANOSIZED BY THE GEL COMBUSTION METHOD

Abstract

    ZnAl2O4 powder has been synthesised at low temperature (6000C) by the combustion of gelprepared from polyvinyl alcohol (PVA), aluminum nitrates, and zince nitrates.Factors affecting the structure and particle size of nanometer oxides ZnAl2O4 include:heating temperature, gelling temperature, molar ratio of metal ions, PVA concentration, pH,heating time.Study the crystal structure and morphology of the oxide by means of X-ray diffraction (XRD),scanning electron microscopy (SEM), transmission electron microscopy through (TEM).Further thermal treatment at 600-7000C in 2h yields the single phase ZnAl2O4. ZnAl2O4powders with crystallite size 20 nm have been prepared. It specific surface area is 41,37m2/g for ZnAl2O4

Keyword: Spinel, ZnAl2O4, nanomaterials, combustions, PVA