Oxygen partial molar free energy

Equations for the Standard Free Energy of Formation and Partial Molar Free Energies of Atomic Oxygen for Plutonium Oxides (1600-2150 K), cal/mol... 

Some earlier thermodynamic studies on rutile reported expressions involving simple idealized quasi-chemical equilibrium constants for point defect equilibria (see, e.g., Kofstad 1972) by correlating the composition x in TiOx with a function of AGm (O2), which is the partial molar free energy of oxygen. However, the structural effects were not accounted for in these considerations. Careful measurements of AGm (O2) in the TiOjc system (Bursill and Hyde 1971) have indicated that complete equilibrium is rarely achieved in non-stoichiometric rutile. 

Figure 5.4 Relative partial molar free energy of oxygen. AGq, of Fei, 0 as a function of composition (log x). (Taken from the data given in S0rensen, 1981.)...

It is convenient to discuss the thermodynamics of nonstoichiometry of oxides in terms of the relative partial molar-free energy of oxygen, AGq, which is defined (Sorensen, 1981) as... 

Figure 10. The calculated partial molar free energies of oxygen ( ij as a function of 8 for La, 2Sr0 8Fe0 55Ti045O3 ,.

Thermodynamics.— The partial molar free energies of oxygen, (p,o2)> at equilibrium between the solid and the gas phases were calculated by using the following equation... 

Figure 3.14. Relative partial molar Gibbs free energy of oxygen of the fission product oxides and of UO2...

Consider location 1. The total enthalpy of the mixture is xoj/ JfojHn2, where Hi is the partial molar enthalpy of species i in the mixture. At location A, the enthalpy of pure oxygen is xq Hq since there are Xoj gmols of pure O2, whose molar enthalpy is Hoj. Since we have ideal gas behavior, = Hoz- Similarly, at location C, where the enthalpy of pure N2 is xn /Hn. Note that this O2 semipermeable membrane allows O2 to come through at the feed partial pressure similarly for the N2 semipermeable membrane. Calculate the Gibbs free energy change as follows ... 

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