LnBaCo₂O_6-δ (Ln = lanthanide) are prospective materials for oxygen separation membranes. These materials show high rates of oxygen surface exchange and diffusivity, and high electrical conductivity. In this work, the La_0.5-xPr_xBa_0.5CoO_3-δ system (0 ≤ x ≤ 0.50) was studied as potential oxygen separation membrane. Samples were synthesized via a combined EDTA-citrate complexing sol-gel process at 1100 °C in air. Dense samples were obtained after 6 h calcination at 1100 °C in air. Single cubic perovskite phase (S.G.$\mathrm{Pm}\overline{3}\mathrm{m}$) was obtained for 0 ≤ x ≤ 0.25, and tetragonal (S.G. P4/mmm) double perovskite phase for 0.30 ≤ x ≤ 0.50. Electrical conductivity (σ) was measured as a function of temperature for La_0.5Ba_0.5CoO_3-δ (La50), La_0.3Pr_0.2Ba_0.5CoO_3-δ (La30) and Pr_0.5Ba_0.5CoO_3-δ (La00) compounds. All the compounds have shown high electrical conductivity, reaching values between 1000 and 2000 Scm⁻¹ at 300 °C. On increasing temperature above 300 °C, the conductivity decreases, exhibiting a metallic-like behavior, taking values of σ = 547, 385 and 714 Scm⁻¹ at 800 °C, for La00, La30 and La50, respectively. Oxygen permeation measurements were carried out as a function of temperature between 700 and 900 °C by varying the He flux between 1 and 100 ml·min⁻¹ on dense membranes of the same thickness (L = 1.4 mm). Ionic conductivities of 0.037, 0.054 and 0.014 Scm⁻¹ were estimated from the oxygen permeation flux at 800 °C for La00, La30 and La50, respectively.

LnBaCo ₂ ö _6-δ（Ln为镧系元素）是用于氧气分离薄膜材料准。这些材料显示出高的氧表面交换率和扩散率，以及高的电导率。在这项工作中，研究了La _0.5-x Pr _x Ba _0.5 CoO3 _-δ体系（0≤x≤0.50）作为潜在的氧分离膜。通过空气中1100°C的EDTA-柠檬酸盐络合溶胶-凝胶复合工艺合成样品。在空气中1100°C煅烧6 h后获得致密样品。单立方钙钛矿相（SG$\mathrm{下午}\overline{3}\mathrm{米}$对于0≤x≤0.25获得），对于0.30≤x≤0.50的四方（SG P4 / mmm）双钙钛矿相。电导率（σ）测量作为温度的拉函数_0.5巴_0.5的CoO _3-δ（LA50），LA _0.3镨_0.2巴_0.5的CoO _3-δ（LA30）和Pr _0.5巴_0.5的CoO _3-δ（La00）化合物。所有化合物均显示出高电导率，在300°C时达到1000至2000 Scm ^-1之间的值。温度升高至300°C以上时，电导率下降，表现出类似金属的行为，取σ= 547、385和714 Scm ^-1在800°C下分别对应La00，La30和La50。通过在相同厚度（L = 1.4 mm）的致密膜上在1至100 ml·min ^-1之间改变He流量，根据700至900°C之间的温度进行氧气渗透测量。从800℃的La00，La30和La50的氧渗透通量估计出0.037、0.054和0.014Scm ^-1的离子电导率。