Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF) in its cubic perovskite phase has attracted much interest for potential use as oxygen transport membrane (OTM) due to its very high oxygen permeability at high temperatures. However, performance degradation due to a sluggish phase decomposition occurs when BSCF is operated below 840 °C. Partial B-site substitution of the transition metal cations in BSCF by larger and redox-stable cations has emerged as a potential strategy to improve the structural stability of cubic BSCF. In this study, the influence of yttrium doping (0…10 mol-%) on oxygen transport properties and stability of the cubic BSCF phase is assessed by in situ electrical conductivity relaxation (ECR) and electrical conductivity measurements during long-term thermal annealing both at 700 °C and 800 °C. Detailed phase analysis is performed by scanning electron microscopy (SEM) after long-term annealing of the samples in air at different temperatures.

立方钙钛矿相中的Ba _0.5 Sr _0.5 Co _0.8 Fe _0.2 O3 _-δ（BSCF）由于其在高温下的很高的氧渗透性而吸引了很多潜在的潜在用途，可作为氧传输膜（OTM）的用途。但是，当BSCF在840°C以下工作时，由于缓慢的相分解而导致性能下降。BSCF中的过渡金属阳离子被较大且氧化还原稳定的阳离子部分B位取代已成为提高立方BSCF结构稳定性的潜在策略。在这项研究中，通过原位评估了钇掺杂（0…10 mol％）对立方BSCF相的氧输运性质和稳定性的影响。在700°C和800°C的长期热退火过程中的电导率弛豫（ECR）和电导率测量。在不同温度的空气中对样品进行长期退火后，通过扫描电子显微镜（SEM）进行详细的相分析。