Regular articleOxygen nonstoichiometry of La1−xSrxCoO3−δ (0 < x ≤ 0.6)
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Phase equilibria and defect chemistry of the La-Sr-Co-O system
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2022, Oxygen Reduction Reaction: Fundamentals, Materials, and ApplicationsInfluence of strontium content on the oxygen surface exchange kinetics and oxygen diffusion in La<inf>1–x</inf>Sr<inf>x</inf>CoO<inf>3–δ</inf> oxides
2019, Solid State IonicsCitation Excerpt :When doping lanthanum cobaltite, ions of alkaline earth metals produced the formation of oxygen vacancies. The oxygen concentration in La1-xSrxCoO3-δ oxides is characterized by oxygen nonstoichiometry, see Fig. 1 [21–24,33–45]. The oxygen nonstoichiometry increases noticeably as the strontium acceptor concentration in the lanthanum sublattice increases, it also depends on the temperature and oxygen partial pressure due to the change in the degree of oxidation of cobalt.
Crystal structure, oxygen nonstoichiometry, and mass and charge transport properties of the Sr-free SOFC/SOEC air electrode material La <inf>0.75</inf> Ca <inf>0.25</inf> FeO <inf>3-δ</inf>
2019, Journal of Solid State ChemistryCitation Excerpt :The oxygen nonstoichiometry δ of LCF7525 increases with increasing temperature and decreasing oxygen partial pressure at 20 ≤ T/°C ≤ 800 and 2 × 10−4 ≤ pO2/bar ≤0.2 (Fig. 5 and Figure S-5 (supplementary material)). LCF7525 shows smaller oxygen deficiencies than other SOFC cathode materials with high Co- and/or Sr-content, such as La0.40Sr0.60CoO3-δ [58,59] and La0.40Sr0.60FeO3-δ [37,60]. By comparing the data obtained for LCF7525 in the present work with previous studies on La1-xCaxFeO3-δ, (0.10 ≤ x ≤ 0.20) [24,25], it is evident that δ increases with increasing Ca-concentration.
Strontium-free rare earth perovskite ferrites with fast oxygen exchange kinetics: Experiment and theory
2018, Journal of Solid State ChemistryInterrelation of transport properties, defect structure and spin state of Ni<sup>3+</sup> in La<inf>1.2</inf>Sr<inf>0.8</inf>Ni<inf>0.9</inf>Fe<inf>0.1</inf>O<inf>4+δ</inf>
2017, Solid State SciencesCitation Excerpt :The dependencies of oxygen non-stoichiometry δ vs P(O2) were measured in the oxygen partial pressure range 10−5–0.21 atm at 800, 850, 900 and 950 °C. The changes of oxygen non-stoichiometry were calculated from the coulometric data according to ref. [29]. The results were recalculated to the absolute value of δ using the reference point determined from the TGA measurements.