Abstract
The hydrothermal transformation of calcium aluminate hydrates were investigated by in situ synchrotron X-ray powder diffraction in the temperature range 25 to 170 °C. This technique allowed the study of the detailed reaction mechanism and identification of intermediate phases. The material CaAl 2O 4·10H 2O converted to Ca 3Al 2(OH) 12 and amorphous aluminum hydroxide. Ca 2Al 2O 5·8H 2O transformed via the intermediate phase Ca 4Al 2O 7·13H 2O to Ca 3Al 2(OH) 12 and gibbsite, Al(OH) 3. The phase Ca 4Al 2O 7·19H 2O reacted via the same intermediate phase to Ca 3Al 2(OH) 12 and mainly amorphous aluminum hydroxide. The powder pattern of the intermediate phase is reported.
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