Title of article :
LOW TEMPERATURE MOLTEN SALT SYNTHESIS OF NANO CRYSTALLINE MgAl2O4 POWDER
Author/Authors :
Safaei-Naeini, Y. iran university of science and technology - School of Metallurgy and Materials Engineering, تهران, ايران , Golestani-Fard, F. iran university of science and technology - School of Metallurgy and Materials Engineering, تهران, ايران , Khorasanizadeh, F. iran university of science and technology - School of Metallurgy and Materials Engineering, تهران, ايران , Aminzare, M. iran university of science and technology - School of Metallurgy and Materials Engineering, تهران, ايران , Zhang, S. University of Sheffield - Department of Materials Engineering, UK
Abstract :
Abstract: MgAl2O4 (MA) nano powder was synthesized via molten salt technique, by heating stochiometric composition of MgO and nano boehmite. The reactant and potassium chloride, as the reaction media, were fired at 800-1000 °C at different dwell times (0.5-5 h) in the ambient atmosphere. After washing and filtration, the spinel nano powder was characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Brunauer-Emmett- Teller (BET) techniques. It was demonstrated that the formation temperature decreased to 850 °C. The nano spinel particles revealed an average size of 30 nm with a narrow size distribution. The mechanism of MgAl2O4 formation was found to be a template type where the morphology and size of product were similar to those of alumina formed from boehmite decomposition. Prolonging the reaction time from 0.5 to 3 h, the reaction was further completed and crystallinity was improved. However, the increase of temperature was more effective in this regard.
Keywords :
spinel nano powder , molten salt method , boehmite
Journal title :
Iranian Journal of Materials Science and Engineering
Journal title :
Iranian Journal of Materials Science and Engineering
