Journal of the American Ceramic Society, Vol.86, No.11, 1959-1961, 2003
Synthesis of magnesium aluminate spinel platelets from alpha-alumina platelet and magnesium sulfate precursors
Spinel platelets were formed from a powder mixture of 3-5 mum wide and 0.2-0.5 mum thick alpha-Al2O3 and 1-8 mum (average 3 mum) MgSO4 heated 2 h at 1200degreesC. The hexagonal platelet shape of the original alpha-Al2O3 platelet was maintained in the spinel, although their size was slightly increased and their surface roughened. When a mixture of alpha-Al2O3 platelets and MgO powder was heated 3 h at 1400degreesC, the spinel formed lost the platelet morphology of the alumina.