钙钛矿氧化物的结构调控及电磁特性研究进展

钙钛矿氧化物因具有独特的结构以及较高的热稳定性在微波吸收领域受到广泛关注,较为常见的电磁调控手段为在钙钛矿结构中掺入不同的离子,但掺杂前后的结构变化及其与电磁吸波特性之间的关联仍待进一步探究。基于此,本论文详细论述了钙钛矿Mn氧化物、Co氧化物、Fe氧化物等的研究进展,阐明了掺杂产生的畸变效应和离子价态变化引起的双交换作用影响磁性、电导率及电磁特性的机制,明晰了钙钛矿氧化物的结构和吸波机理,并指出了存在的问题及以后的发展方向。

Research Progress of Microstructure Control and Electromagnetic Wave Absorbing Properties of Perovskite Oxides

Perovskite oxides have attracted much attention in the field of microwave absorption due to their unique structure and high thermal stability. The most common way to adjust the electromagnetic properties is to add different ions into the perovskite structure, but there is disadvantage study of structure changes before and after doping, and the relationship between the structure changes and electromagnetic absorption characteristics. Based on this, the research progress of perovskite Mn oxide, Co oxide, Fe oxide materials is analyzed in detail from the rule of electromagnetic wave absorption properties which vary with the change of magnetism and conductivity, which is due to the distortion effect caused by the change of perovskite structure and the double exchange of free electrons caused by the change of ionic valence state in the crystal. The structure and microwave absorption mechanism of perovskite oxides are introduced, and the existing problems and future development direction are pointed out.