EFFECTS OF PROCESSING PARAMETERS ON FORMATION OF NANO-SPINEL (MgAl2O4) FROM LiCl MOLTEN SALT

MgAl2O4 nanoparticles were synthesised at 850 C using the molten salt method, and the effects of processing parameters including temperature, holding time and the amount of salt on the crystallisation of MgAl2O4 were investigated. Nano-alumina, magnesia and lithium chloride were used as starting mat...

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Bibliographic Details
Published in:Ceramics international 2013-01, Vol.39 (6), p.6265-6270
Main Authors: Fazli, R, Fazli, M, Safaei-Naeini, Y, Golestani-fard, F
Format: Article
Language:English
Subjects:
Aluminum oxide
Crystallization
Fused salts
Magnesium oxide
Nanocomposites
Nanomaterials
Nanostructure
Process parameters
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Summary:MgAl2O4 nanoparticles were synthesised at 850 C using the molten salt method, and the effects of processing parameters including temperature, holding time and the amount of salt on the crystallisation of MgAl2O4 were investigated. Nano-alumina, magnesia and lithium chloride were used as starting materials. A LiCl molten salt provided a liquid medium for the reaction between Al2O3 and MgO to form MgAl2O4. The results showed that MgAl2O4 began to form at about 650 C and after the temperature was increased to 1000 C, the amounts of MgAl2O4 in the resultant powders increased with a concomitant decrease in the Al2O3 and MgO contents. After washing with hot distilled water, the samples, heated for 3 h at 850 C, were single-phase MgAl2O4 with a 30-50 nm particle size. Furthermore, the synthesised MgAl2O4 particles retained the size and morphology of the Al2O3 powders, which indicated that a template formation mechanism dominated the formation of MgAl2O4 by the molten-salt method.
ISSN:0272-8842
DOI:10.1016/j.ceramint.2013.01.047