Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF) exhibits a very high oxygen permeability in its cubic perovskite phase, making it a promising candidate for high-temperature energy-related applications such as oxygen-transport membranes. It suffers, however, from a pronounced phase instability at application-relevant temperatures below 840 °C which is presumed to result from a valence change of B-site cobalt. In an attempt to stabilize the cubic BSCF phase, monovalent Y³⁺ was doped in small concentrations (1–10 mol-% yttrium) onto its B-site. The influence of this doping on the physico-chemical properties (electrical conductivity, reductive stability, lattice constant), on the sintering behavior, and on the oxygen permeation of BSCF has been systematically investigated. Despite a slightly adverse effect to permeability (decrease in oxygen permeation by about 20–30%), a doping concentration of 10 mol-% Y is found to completely suppress secondary-phase formation and, hence, stabilize the cubic BSCF system at 800 °C. These findings are extremely promising with regard to a long-term operation of BSCF in atmospheres free of acidic impurity gases.

Ba _0.5 Sr _0.5 Co _0.8 Fe _0.2 O3 _-δ（BSCF）在其立方钙钛矿相中表现出非常高的透氧性，使其成为与高温能量相关的应用（如氧气传输膜）的有希望的候选者。但是，它在与应用相关的低于840°C的温度下遭受明显的相不稳定，这可能是由于B位钴的化合价变化所致。为了稳定立方BSCF相，单价Y ³⁺被低浓度（1-10 mol％的钇）掺杂到其B位置。已经系统地研究了这种掺杂对理化性质（电导率，还原稳定性，晶格常数），对烧结行为以及对BSCF的氧渗透的影响。尽管对渗透性有轻微的不利影响（氧气渗透率降低了约20–30％），但发现10 mol％Y的掺杂浓度可以完全抑制第二相的形成，因此可以将立方BSCF系统稳定在800° C。这些发现对于在无酸性杂质气体的环境中对BSCF的长期运行而言是极为有前途的。