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

Oxygen nonstoichiometry of La _{1- x}Sr _xCo _{1- y}Me _yO _{3- 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(P)=f(δ) to the set of experimental data. Partial molar enthalpy and partial molar entropy of oxygen in La _{1- x}Sr _xCo _{1- y}Me _yO _{3- δ} (Me = Ni, Fe) were calculated.