Crystal structure and magnetic properties of high-oxygen pressure annealed Sr1−xLaxCo0.5Fe0.5O3−δ (0⩽x⩽0.5)

Electrolyte-supported IT-SOFC with LSCF–SCFN composite cathode

“…After 12 h of heating, a total decomposition of the sample into mixture of Ruddlesden-Popper phases (with n = 1 and 2) and NiO was observed. Contrary to the previous reports for SrCo 0.2 Fe 0.8 O 3-δ [10] and SrCo 0.5 Fe 0.5 O 3-δ [11], for which a characteristic oxygen vacancy ordering was shown, in the case of SrCo 0.2 Fe 0.6 Ni 0.2 O 3-δ perovskite no such ordering can be observed in our XRD experiments. In case of Ce 0.85 Gd 0.15 O 1.925 , a typical cubic, fluorite-like phase was observed with no additional phases present (Fig.…”

“…Assuming similar δ for SrCo 0.2 Fe 0.6 Ni 0.2 O 3-δ at room temperature, at temperatures around 1000°C the oxygen content in the material would be close to 2.5 mol·mol − 1 . The presented calculation is supported by an absence of a brownmillerite (ABO 2.5 ) related plateau on the TG curve, which appears for materials with δ ≈ 0.5 mol·mol − 1 [11]. Further oxygen loss (δ ≫ 0.5 mol/mol) would most likely induce decomposition of SrCo 0.2 Fe 0.6 Ni 0.2 O 3-δ , which was observed during reduction experiment.…”

“…Comparing to the room temperature, SrCo 0.2 Fe 0.6 Ni 0.2 O 3-δ loses 0.21(1) mol·mol − 1 of oxygen at 1000°C. The unknown initial oxygen content, which is supposed to be in the 2.5-3.0 range [11], gives only ±0.01 error to such a calculation. Furthermore, for the sample with similar chemical composition SrCo 0.2 Fe 0.8 O 3-δ , the room temperature oxygen content was evaluated to be 2.75 mol·mol − 1 [10].…”

First-principles study of the morphology and surface structure of LaCoO3 and La0.5Sr0.5Fe0.5Co0.5O3 perovskites as air electrodes for solid oxide fuel cells

“…The total energy distribution of GA-derived structures is reduced as the number of GA generations increased. The best structure (lowest energy) is shown in Figure 3 (b), where no clear cation ordering is observed, which is in good agreement with experimental results [59]. In addition, the GAoptimized cationic arrangements at the surface of LSCF5555 are shown in Figure 4.…”

Formation of Solid Solutions and Physicochemical Properties of the High-Entropy Ln1−xSrx(Co,Cr,Fe,Mn,Ni)O3−δ (Ln = La, Pr, Nd, Sm or Gd) Perovskites

“…The values from Table 4 clearly show the similarities between all compositions from the studied Ln(Co,Cr,Fe,Mn,Ni)O 3−δ series, with the electrical conductivity (generally) increasing with the increase of lanthanide ionic radius. Also, the results can be correlated with the mean TM-O distance [43,44] generally decreasing with increasing value of σ max , see Figure S2. This is likely due to the decrease of structural distortion and better overlapping of the 3d TM -2p O orbitals [23].…”