Microwave-assisted combustion synthesis of nanocrystalline MgAl2O4 spinel powder

A stoichiometric MgAl2O4 spinel powder was synthesised by a microwave-assisted combustion synthesis (MWCS) route. For comparison, another powder was also prepared following the conventional combustion synthesis (CCS) method. The batch size had a strong influence on the specific surface area, which i...

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Bibliographic Details
Published inCeramics international Vol. 31; no. 1; pp. 67 - 74
Main Authors GANESH, I, JOHNSON, R, RAO, G. V. N, MAHAJAN, Y. R, MADAVENDRA, S. S, REDDY, B. M
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Science 2005
Subjects
Chemical synthesis; combustion synthesis
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Materials science
Materials synthesis; materials processing
Nanopowders
Nanoscale materials and structures: fabrication and characterization
Physics
Combustion synthesis
Inorganic compounds
Aluminium Magnesium Oxides Mixed
Microwave radiation
Thermogravimetry
Oxides
Differential thermal analysis
XRD
Experimental study
Ultrafine powder
Aluminium Oxides
Transmission electron microscopy
Spinel
Spinels
Chemical preparation
Magnesium Oxides
Nanostructured materials
Nanocrystal
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Summary:A stoichiometric MgAl2O4 spinel powder was synthesised by a microwave-assisted combustion synthesis (MWCS) route. For comparison, another powder was also prepared following the conventional combustion synthesis (CCS) method. The batch size had a strong influence on the specific surface area, which in turn is highly dependent on the preparation route. The surface areas of the powders decreased from 36.78 to 0.1 m2/g for MWCS and 126 to 8.06 m2/g for CCS samples, respectively, when the batch size was increased from 2 to 100 g. This may be due to sintering of the samples due to the high adiabatic temperature generated as a result of increased heat accumulation with larger batch quantities. The powders obtained by MWCS and CCS routes were found to contain grains/crystals in the size range of 20-50 and 100-250 nm, respectively. TG-DTA and XRD studies reveal that the MWCS route yields materials with a higher degree of compositional stability and phase purity as compared to the CCS method. 26 refs.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2004.03.036