Abstract
In the presence of sodium sulfate as a flux, α-alumina particles, composed of highly aggregated platelets, were synthesized by conventional thermal and microwave heating of Al2(SO4)3 powders at 900–1100°C for 1h in an alumina crucible. The size of α-alumina platelets increased with increasing flux concentrations and temperatures in both conditions of conventional thermal and microwave heating. However, the sizes and size distributions of α-alumina platelets obtained by microwave heating were smaller and narrower, relatively, compared to those obtained by conventional thermal heating. It was assumed that microwaves had a significant non-thermal effect in the stage of nucleation and crystal growth of α-alumina.
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