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Decomposition temperatures of barium peroxide in equilibrium with the oxygen pressure in the gas phase have been determined by thermogravimetric measurements at temperatures from 670 to 843‡. Enthalpies and entropies of the reaction BaO2= =BaO+0.5O2 and of the formation of BaO2 have been calculated.
The thermal behaviour of C-type PrO1.50, A-type PrO1.50 and PrO1.833 was investigated by thermodilatometric and DTA measurements in the temperature range from 20 to 1200 °C in air and in a hydrogen atmosphere. The phase transition C-type PrO1.50 → A-type PrO1.50 proceeds at 790±10 °C; C-type PrO1.50 is stable only below this temperature, but A-type PrO1.50 in the whole range. Pro1.833 is stable up to 400 °C at atmospheric pressure. When heated further it decomposes stepwise forming several defined intermediate oxide phases.
