Abstract

AbstractThe decomposition under vacuum of the carbonates of calcium, strontium and barium was investigated by differential thermal analysis (DTA), electrothermal analysis (ETA) and dilatometry.The results indicate that the rates of sintering of the oxide produced by the decomposition of the corresponding carbonate are in the order predicted by their respective Tammann temperatures, i.e. BaO>SrO>CaO. DTA studies on the decomposition of samples of barium carbonate have shown that great care must be taken to ensure that the decomposition is carried out under the highest vacuum attainable, in order to eliminate the formation of a basic carbonate. Further evidence of the formation of free barium by this decomposition process is also reported.

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