Abstract
Abstract The gas-solid reaction between CO2 and activated CaO (obtained from the decomposition of calcite under vacuum conditions) leads to the formation of X-ray amorphous calcium carbonate. In the temperature range 560–590 K the exothermic recrystallization of the amorphous material is observed by DTA. Further related phenomena are characterized by X-ray diffraction and electron microscopy. The results reveal an easy and widely applicable preparative pathway for the formation of amorphous solids.
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