The low temperature preparation of nanocrystalline MgAl2O 4 spinel by citrate sol-gel process

Abstract

Nanocrystalline MgAl2O4 is synthesized by citrate sol-gel process, which is characterized by high-temperature X-ray diffraction (HT-XRD), differential thermal analysis coupled with thermogravimetric (TG-DTA) and scanning electron microscopy (SEM). The precursor gel yields an amorphous oxide phase at 550°C and begins to crystallize to the MgAl2O 4 at 600°C. The isoelectric point (IEP) of nanocrystalline MgAl2O4 is about pH 11.8. © 2003 Elsevier B.V. All rights reserved.