Abstract
Ca 3Al 2O 6 was synthesized via citric acid precursor. The effects of the molar ratio of citric acid to total metal cations concentration (CA/M) on the formation of Ca 3Al 2O 6 were investigated. Increasing the CA/M promoted the formation of Ca 3Al 2O 6. Single-phase and well-crystallized Ca 3Al 2O 6 was obtained from the CA/M = 1, CA/M = 2 and CA/M = 4 precursor at temperatures 1100 °C, 1100 °C and 1000 °C, respectively. Ca 4Al 6O 13 and Ca 5Al 6O 14 were formed as intermediate phases. No Ca 12Al 14O 33 or CaAl 2O 4 was observed. The mechanism of formation of Ca 3Al 2O 6 was discussed. Differential thermal analysis and thermogravimetric (DTA/TG) and X-ray diffractometry (XRD) were used to characterize the precursors and the derived oxide powders.
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