Perovskite-type Pr_0.6Sr_0.4FeO_3-δ (PSF) material was prepared by the sol-gel method and systematically evaluated as an oxygen transport membrane (OTM). The material was accompanied by a phase transition with the temperature elevated, and the detailed phase evolution process was accurately detected by the high-temperature in situ X-ray diffraction and the thermogravimetric analysis technologies. The phase transition is related to the oxygen vacancy concentration. The effects of phase transition on structural parameter, oxygen permeability, rate-controlling step, and stability were investigated. The high-temperature cubic phase has a higher thermal expansion coefficient than the orthorhombic phase, which is more favorable for the movement of lattice oxygen. Combining experimental results and oxygen permeation model, demonstrated that the phase transition leads to the rate-controlling step changing from bulk diffusion to oxygen interfacial exchange. Furthermore, the high-temperature cubic phase is beneficial to limit the migration of the Sr ions and ensure higher operation stability.

钙钛矿型Pr _0.6 Sr _0.4 FeO _{3- δ}（PSF）材料是通过溶胶-凝胶法制备的，并被系统评估为氧气传输膜（OTM）。该材料伴随温度升高而发生相变，并且通过高温原位X射线衍射和热重分析技术准确地检测到详细的相变过程。相变与氧空位浓度有关。研究了相变对结构参数，透氧性，速率控制步骤和稳定性的影响。高温立方相比正交相具有更高的热膨胀系数，这对于晶格氧的移动更有利。结合实验结果和氧气渗透模型，证明了相变导致速率控制步骤从本体扩散变为氧界面交换。此外，高温立方相有利于限制Sr离子的迁移并确保更高的操作稳定性。