The thermodynamics of melts in the system VO2−V2O5
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Using a gravimetric technique, the oxygen isobars in the liquid phase field of the system VO2−V2O5 have been determined in the temperature range 1020° to 1100°C and in the oxygen pressure range 0.01 to 0.4 atm, and the VO2 liquidus and solidus curves have been determined in the temperature range 953° to 1081°C. From these results have been calculated the activities of the components VO2 and VO2.5 in the system and the standard free energy change for the reaction 2VO2 (S)+1/2O2 (g)=V2O5 (1). The latter was determined to be ΔG o=−17780+7.64T in the temperature range 1020° to 1100°C.
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