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从钙钛矿的结构特点出发,阐述其相关结构构筑的原理.着重讨论新型三方展状钙钛矿系列化合物(La_(n+1)Mn_nO_(3n+3)(Ca_2O)的设计思路.分析离子半径大小、氧化态和电荷平衡、离子的配位方式等因素对新物相形成的影响.介绍在La-A-Mn-O体系(A=碱土离子)中合成三方层状钙钛矿化合物的实验结果.所得n=1的物相La_2Ca_2MnO_7由三方钙钛矿单元层(La_2MnO_6)和类石墨结构单元层(Ca_2O)沿c轴方向交替排列而成.最后简要介绍三方层状钙钛矿化合物的磁性质.
Based on the structural characteristics of perovskite, the principle of structure-related construction was expounded, and the design of La_ (n + 1) Mn_nO_ (3n + 3) (Ca_2O) Radius size, oxidation state and charge balance, the coordination mode of ions and other factors on the formation of new phase.Introduced in the La-A-Mn-O system (A = alkaline earth ions) synthesis of ternary layered perovskite compounds The results show that the phase La_2Ca_2MnO_7 with n = 1 is formed by the alternating arrangement of the trivalent perovskite unit layer (La_2MnO_6) and the graphite-like structural unit layer (Ca_2O) along the c axis direction.Finally, the three-layered layered perovskite Magnetic properties.