Dual phase oxygen transport membranes were prepared via solid state reaction at 1200 ℃. The sintered membranes were characterized via X-ray diffraction, back scattered electron microscopy and electron backscatter diffraction, and associated with image analysis and calculations to quantify phase compositions and microstructural features including volume fractions, grain sizes, and contiguity. The characterizations reveal a multi-phase system containing Ce_1-xGd_xO_2-δ’ (x ≈ 0.1) (CGO10), and Fe_yCo_3-yO₄ (0.2 < y < 1.2) (FCO), CoO and Gd_0.85Ce_0.15Fe_0.75Co_0.25O₃ (GCFCO) in the sintered membranes. In addition, a novel model is utilized to assess the evolution of the ambipolar conductivity with respect to microstructural features. Both experimental and calculated results indicate that if the grain sizes of all phases in the composites are similar, the optimal ambipolar conductivity is reached with a volume ratio of ionic conducting phase to electronic conducting phase close to 4:1. Meanwhile, the GCFCO phase dominates the effective electronic conductivity.

在1200℃下通过固相反应制备了双相输氧膜。烧结膜通过X射线衍射，反向散射电子显微镜和电子反向散射衍射进行表征，并与图像分析和计算相关联，以量化相组成和微观结构特征，包括体积分数，晶粒尺寸和连续性。的表征揭示了含Ce的多相系统_{-1- X}的Gd _X ö _{2- δ”}（X ≈0.1）（CGO10），和Fe _ÿ钴_{3- Ý} ø ₄（0.2 < Ý <1.2）（FCO），COO和Gd _0.85 Ce _0.15烧结膜中的Fe _0.75 Co _0.25 O ₃（GCFCO）。另外，利用新颖的模型来评估关于微结构特征的双极性电导率的演变。实验和计算结果均表明，如果复合物中所有相的晶粒尺寸相似，则离子导电相与电子导电相的体积比接近4：1时，可获得最佳双极性电导率。同时，GCFCO相占有效的电子电导率。