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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Thermoanalysis of the system BaO2-BaO-O2 has been carried out at oxygen pressures from 0.2 to 1.5 atmospheres using a Netzsch STA-409 simultaneous analyser. Measurements were made over the temperature range from 25 to 950°C. The thermogravimetric data obtained have been used to evaluate the non-stoichometric region boundaries for BaO2 and to estimate the same region for BaO. The temperatures of the monovariant equilibrium BaO1+x1<->BaO2−x2 have been determined: Tmon = 990, 1041, 1083 and 1109 K at PO2 = 0.2, 0.5, 1.0 and 1.5 oxygen atmospheres, respectively. For the reaction BaO1.0 + 0.5O2 = BaO2.0, the values ΔG⦵T = −5.1, −2.1, 0.3, and 1.7 kJ mol−1 have been calculated for the above respective temperatures.