MgAl 2O 4 spinel precursor was prepared using a heterogeneous sol-gel process. The effect of high-energy milling on the precursor decomposition and spinel formation was investigated. The milling decreased the Al(OH) 3 dehydroxylation temperature from 190deg to about 130degC. The activation energy for spinel formation decreased from 688 kJ/mol for the as-prepared precursors to 468 kJ/mol for the precursors milled for 5 h. Milling of the precursor lowered the incipient temperature of spinel formation from 900deg to 800degC, and the temperature of complete MgAl 2O 4 spinel formation from >1280deg to ~900degC
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