Oxygen nonstoichiometry and defect structure of perovskite-type oxides in the La–Sr–Co–(Fe, Ni)–O systems

Oxygen nonstoichiometry of La1−xSrxCo1−yMeyO3−δ (Me = Ni, Fe) has been studied as a function of temperature and oxygen partial pressure (1 to 10−3 atm) by TGA. The defect structure of complex oxides was described within the point defects approach by fitting the parameters of theoretical equations log(PO2)=f(δ)log(PO2)=f(δ) to the set of experimental data. Partial molar enthalpy and partial molar entropy of oxygen in La1−xSrxCo1−yMeyO3−δ (Me = Ni, Fe) were calculated.

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