阴离子调控锰基钙钛矿中Mn─O的键长和磁性  

Anion-Controlled Mn─O Bond Length and Magnetic Properties in Manganese-Based Perovskites

作　　者：史文舒 段龙辉 刘传强 杨化磊 王博 郑贝宁 张媛 韩梅 冯守华[1] SHI Wenshu;DUAN Longhui;LIU Chuanqiang;YANG Hualei;WANG Bo;ZHENG Beining;ZHANG Yuan;HAN Mei;FENG Shouhua(State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,Jilin University,Changchun 130012,China;College of Physics,Jilin University,Changchun 130012,China)

机构地区：[1]吉林大学无机合成与制备化学国家重点实验室,长春130012 [2]吉林大学物理学院,长春130012

出　　处：《吉林大学学报(理学版)》2025年第1期151-159,共9页Journal of Jilin University:Science Edition

基　　金：国家重点研发计划项目(批准号:2023YFA1506300);吉林省自然科学基金(批准号:20140101171JC);吉林省科学科技发展计划项目(批准号:SKL202402007);实验技术课题吉林大学项目(批准号:SYXM2024a004).

摘　　要：通过水热法合成锰基钙钛矿La_(1-x-y)Ca_(x)K_(y)MnO_(3)(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.We synthesized manganese-based perovskite La_(1-x-y)Ca_(x)K_(y)MnO_(3)(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.

关 键 词：锰酸盐钙钛矿 阴离子调控 键长 磁性变化 

分 类 号：O611[理学—无机化学]