Abstract A composition- and temperature-dependent mobility database of all ionic species in the LaCoO 3- δ phase was developed and combined with a La-Co-O thermodynamic database to simulate kinetic demixing and partial decomposition in LaCoO 3- δ oxygen membranes operated under a 0.0001/0.21 bar oxygen partial pressure difference at 1073 K for 1 year. Formation of La 2 O 3 , Co 3 O 4 and CoO phases across the membrane is predicted. The kinetic demixing process can be divided into two stages, namely, establishment of the oxygen potential gradient (fast) and demixing of the cations (slow); the former is controlled by the mobility of oxygen ions, and the latter is determined by the higher mobility of Co ions as compared to the La ion in the ABO 3 -type perovskite. A drift motion of both oxide surfaces towards the high P O 2 side occurs with the movement of cations.

中文翻译：

---

氧势梯度下LaCoO 3-δ 氧膜中动力学分层和分解的数值模拟

摘要 开发了 LaCoO 3- δ 相中所有离子物种的组成和温度相关迁移率数据库，并与 La-Co-O 热力学数据库相结合，以模拟 LaCoO 3- δ 氧膜在0.0001/0.21 bar 氧分压差在 1073 K 下持续 1 年。预计会在膜上形成 La 2 O 3 、Co 3 O 4 和 CoO 相。动力学分层过程可分为氧势梯度建立（快）和阳离子分层（慢）两个阶段；前者是由氧离子的迁移率控制的，而后者是由与 ABO 3 型钙钛矿中的 La 离子相比更高的 Co 离子迁移率决定的。