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Abstract. Barium aluminates were formed by the continuous precipitation method at different values of pH. The influence of ageing process and precipitation pH on the phase composition of the precipitate after firing was found. It was showed that there is growth of the 3BaOAl2O3 concentration after ageing of precipitate during 7 days. Presumably, this process is associated with a decrease in the number of crystals, increasing their size in the ageing process of precipitate and chemical processes that occur during ageing: hydrolysis, hydration, dehydration.

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Barium aluminates have been obtained by the method of continuous precipitation at different values of pH. The method of thermal analysis showed that the main mass losses which are connected with dehydration processes occur in the temperature interval from 50 °C to 100 °C and from 150 °C to 200 °C. In addition, mass loss occurs in the temperature interval from 780 °C to 1000 °C which can indicate barium aluminate formation. XRD analysis was applied to determine phase composition of obtained substance and showed formation of Ba1.17Al10.67O17.17 and BaAl2O4 at pH 6.5; 7.0 and 7.5 respectively. Significant influence of pH on precipitation composition has not been detected.