钙钛矿型透氧膜材料的结构特点与研究进展

Structure Characteristics and Research Progress of Perovskite Type Oxygen Permeation Membranes

立方钙钛矿结构材料是理想的透氧膜材料之一,通过对其A、B位不同离子的掺杂可以提高材料的透氧率,改善材料在低氧条件下的结构稳定性。材料的晶胞自由体积、金属-氧平均键强、关口尺寸是影响材料氧离子电导的主要因素,而容差因子、金属-氧平均键强是影响材料结构稳定性的主要因素。本文介绍了钙钛矿结构的特点及其畸变,提出了掺杂元素的选择策略,并详细阐述了透氧膜材料的研究进展。

The cubic perovskite type material is one of the ideal oxygen permeation membrane materials. Doping with different elements on the A and/or B sites of perovskite structure can increase the oxygen permeation flux and improve the structural stability of materials under low oxygen partial pressure. The free volume of crystal cell, the average metal-oxygen bond energy, and the critical radii of the opening between the two A site cations and one B site cation are the main factors that influence the oxygen ion conductivity of materials, while the tolerance factor of perovskite and the average metal-oxygen bond energy have strong impact on the stability of the perovskite structure. In this survey, the perovskite structure characteristics and its distortion were introduced in detail, and then a criterion for dopant selection to improve the oxygen ion conductivity and structural stability of the parent perovskite oxides was proposed. At the end, the research progress of oxygen permeation membranes was reviewed .