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系统地总结了双钙钛矿氧化物的晶体结构特点,根据阳离子有序性的不同将双钙钛矿材料分为3类,即岩盐有序、柱状有序和层状有序,并分析了各类有序的形成条件;从B位含有非磁性阳离子的角度入手,介绍了锑基双钙钛矿氧化物的晶体结构特点及其易获得高度B位岩盐有序的机制,并以几种典型的锑基双钙钛矿氧化物为例讨论了该类氧化物的磁、电性质,特别是B位有序度等晶体结构的改变对该类氧化物物理性质的影响。最后介绍了关于A位为不同稀土离子、B位含锑双钙钛矿氧化物的最新研究工作,研究结果表明随着A位稀土离子的替换介电常数ε’值呈单调递减的趋势,说明镧系收缩抑制了过渡金属离子之间的3d电子的跃迁从而抑制极化畴的翻转;对于B位为不同过渡金属元素的化合物,介电常数ε’值按照磁矩减小的趋势呈单调递减规律,反映了磁性与介电性质之间存在着一定的耦合关系,这对更加深入地研究和探索双钙钛矿氧化物材料的磁电性质提供了有价值的参考信息。
The crystal structure characteristics of double perovskite oxides are systematically summarized. According to the orderliness of cations, the double perovskite materials are divided into three categories, ie, ordered ordered rock salt, ordered ordered and layered order, and analyzed Starting from the point of containing non-magnetic cations in B-site, the crystal structure characteristics of antimony-based double-perovskite oxides and the ordering mechanism of rock salt with high B-site are introduced. The typical antimony-based double-perovskite oxide is taken as an example to discuss the influence of the change of the crystal structure such as the magnetic and electrical properties, especially the order of the B-site, on the physical properties of the oxide. Finally, the latest research work on the different A and B antimony double perovskite oxides with different rare earth ions is presented. The results show that the ε ’values of the replacement rare earth ions monotonically decrease with the monotonous decrease The lanthanide shrinkage suppresses the transition of the 3d electrons between the transition metal ions and thus the polarization domain reversal. For the compounds with different transition metal elements at the B site, the dielectric constant ε ’decreases monotonically with decreasing magnetic moment The law indicates that there is a certain coupling relationship between the magnetic and dielectric properties, which provides valuable reference information for further researching and exploring the magnetoelectric properties of double perovskite oxide materials.