【摘要】 通过水热法合成锰基钙钛矿La_1-x-yCa_xK_yMnO₃（LCKMO）,研究其水热生长过程中阴离子摩尔分数对Mn—O键长的影响及其对磁学性能的调控作用.研究结果表明：所有样品均为钙钛矿结构，且在K⁺掺杂下产生超结构反射；所制备的样品表面呈光滑的单晶立方体形貌；钙钛矿中Mn—O键长与反应生长过程中的阴离子摩尔分数呈正相关；不同Mn—O键长的LCKMO样品均表现出室温铁磁性，但相同温度下的饱和磁化强度和矫顽力存在显著差异；样品的阻塞温度随Mn—O键长的增加而上升.研究结果为优化钙钛矿材料的磁学性能提供了实验指导，并加深了对潜在物理过程的理解.更多还原

【Abstract】 We synthesized manganese-based perovskite La_1-x-yCa_xK_yMnO₃（LCKMO） by hydrothermal method and studied the effect of anion mole fraction on the Mn—O bond length duing its hydrothermal growth process, as well as its regulatory effect on magnetic properties. The research results show that all samples have a perovskite structure and exhibit superlattice reflection under K⁺ doping. The surface of the prepared samples presents smooth single-crystal cubic morphology. The Mn—O bond length in perovskite is positively correlated with the anion mole fraction during the reaction growth process. The LCKMO samples with different Mn—O bond lengths all exhibit room-temperature ferromagnetism, but there are significant differences in their saturation magnetization and coercivity at the same temperature. The blocking temperature of the samples increases with the increase of Mn—O bond length. The research results provide experimental guidance for optimizing the magnetic properties of perovskite materials and deepen the understanding of the underlying physical processes.更多还原