Synthesis of nanocrystalline magnesium aluminate (MgAl 2O 4) spinel powder by the urea–formaldehyde polymer gel combustion route

Nanocrystalline MgAl 2O 4 spinel powder was synthesized by the urea–formaldehyde (UF) polymer gel combustion route. A transparent gel formed from magnesium nitrate, aluminium nitrate and UF after drying underwet self-sustained combustion when initiated with a burning splinter. The combustion product...

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Bibliographic Details
Published in:Materials research bulletin 2009-03, Vol.44 (3), p.613-618
Main Authors: Prabhakaran, K., Patil, D.S., Dayal, R., Gokhale, N.M., Sharma, S.C.
Format: Article
Language:English
Subjects:
A. Oxides
B. Chemical synthesis
C. Thermo gravimetric analysis
C. X-ray diffraction
D. Microstructure
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Summary:Nanocrystalline MgAl 2O 4 spinel powder was synthesized by the urea–formaldehyde (UF) polymer gel combustion route. A transparent gel formed from magnesium nitrate, aluminium nitrate and UF after drying underwet self-sustained combustion when initiated with a burning splinter. The combustion product on calcinations at 850 °C formed MgAl 2O 4 spinel. Calcination of the combustion product resulted in particle coarsening. The powder obtained by planetary ball milling of the spinel had a median particle size of 1.58 μm. The spinel particles are agglomerates of nanocrystallites of size in the range 10–30 nm. The compacts prepared by uni-axial pressing of the spinel powder sintered to >99% TD at 1600 °C.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2008.06.029