Abstract
Submicron MgO powders have been synthesized from thermal decomposition of magnesium chelates or acetate at around 200 °C in liquid alcohol or supercritical alcohol-CO 2 mixtures. Because of a similar coordination of the magnesium atom in both types of precursors, a common amorphous alkoxy-hydroxy derivative is first obtained. When the reaction occurs in a supercritical medium with carbon dioxide as cosolvent, the microstructure of the solid is quite different and a CO 2 group is incorporated into the alkoxy bond. In all cases, the intermediate compound crystallizes into cubic magnesium oxide under thermal treatment between 400 and 600 °C; the elementary particle size in the powders obtained is less than 100 nm.
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