SrCo_0.9Nb_0.1O_3−δ (SCN) has been investigated for oxygen transport membrane and solid oxide fuel cell applications as it is more stable than the state-of-the-art Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ (BSCF) material. Here, the crystal structure and transport properties of SCN were systematically investigated. Combined neutron and high-temperature X-ray powder diffraction analyses over the temperature range of 25–800 °C showed that the crystal structure of SCN belongs to the tetragonal space group P4/mmm with the unit cell a_c × a_c × 2a_c, where a_c is the lattice parameter of the cubic perovskite at temperatures <160 °C. The tetragonal (P4/mmm) to cubic (Pm3̅m) phase transition occurred in SCN with increasing temperature. This phase transition affected the electrical conductivity, whereas the impact on the magnetic susceptibility was not significant. The surface exchange and diffusion coefficients of SCN in the temperature range of 600–850 °C were characterized by electrical conductivity relaxation and oxygen permeation measurements. The self-diffusion and surface exchange coefficient of SCN are comparable with those of BSCF. Hence, SCN shows promise as a next-generation mixed ionic–electronic conducting ceramic.

中文翻译：

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快速离子传导SrCo _0.9 Nb _0.1 O3 _-δ的晶体结构和输运性质

的SrCO _0.9的Nb _0.1 ø _3-δ（SCN）已被研究用于氧气传送膜和固体氧化物燃料电池中，因为它是比国家的最先进的巴更稳定的_0.5锶_0.5钴_0.8的Fe _0.2 ø _3-δ（BSCF）材料。在这里，系统地研究了SCN的晶体结构和传输性能。在25–800°C的温度范围内进行中子和高温X射线粉末衍射相结合的分析表明，SCN的晶体结构属于四边形空间群P 4 / mmm，晶胞为a _c × a _c×2一_ç，其中一个_Ç是立方钙钛矿在温度<160℃的晶格参数。正方晶（P 4 / MMM），以立方（PM 3米随温度升高，SCN中发生相变。该相变影响电导率，而对磁化率的影响并不显着。SCN在600–850°C的温度范围内的表面交换和扩散系数通过电导率松弛和氧渗透测量来表征。SCN的自扩散和表面交换系数与BSCF相当。因此，SCN有望成为下一代混合离子电子导电陶瓷。