一种在室温下具有强磁介电耦合的钙钛矿型金属有机框架介电材料  

A Perovskite Type Metal-Organic Frame Dielectric Material with Strong Magnetodielectric Coupling at Room Temperature

作　　者：王冉 孙焦焦 凌浪生[2] 童伟 皮雳[2,3] 张仕乐 WANG Ran;SUN Jiaojiao;LING Langsheng;TONG Wei;PI Li;ZHANG Shile(.Institutesof Physical Science and Information Technology,Anhui University,Hefei,Anhui,230601,People’s Republic of China;High Magnetic Field Laboratory,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Universityof Science and Technology of China,Hefei 230026,China)

机构地区：[1]安徽大学物质科学与信息技术研究院,合肥230601 [2]中国科学院合肥物质科学研究院,强磁场科学中心,合肥230031 [3]中国科学技术大学,合肥230026

出　　处：《低温物理学报》2023年第6期297-303,共7页Low Temperature Physical Letters

基　　金：合肥综合性国家科学中心强光磁关键技术预研项目(E06DPK11)资助的课题。

摘　　要：磁电耦合材料在下一代存储器件中具有巨大的潜在应用,其中钙钛矿型多铁性金属有机框架材料因其易于实现对磁性和电性的调控而受到广泛关注.在这项工作中,我们将Cr^(2+)引入到[NH_(4)][Mn(HCOO)_(3)]晶体框架中.当Cr^(2+)掺杂比例为2.38%时,铁电有序温度从零掺杂的231 K上升到270 K,在外加5 T磁场作用下,其铁电有序温度从零场的270 K提高到296 K,磁介电系数达到154%,金属有机框架表现出明显的磁介电效应.这个结果表明,引入Cr^(2+)离子作为晶体结构的构建块,是合成具有较高磁介电耦合效应材料的一种可行性方法.Magnetoelectric coupling materials have great potential applications in the next generation of memory devices,among which perovskite-type multiferroic metal-organic framework materials are widely concerned because of their easy realization of magnetic and electrical regulation.In this work,we introduce Cr^(2+)intothe[NH_(4)][Mn(HCOO)_(3)]crystal framework.When the doping ratio of Cr^(2+)is 2.38%,the ferroelectric order temperature increases from 231K to 270K.Under a 5T magnetic field,the ferroelectric order temperature increases from 270K to 296K,and the magnetodielectric coefficient reaches 154%,showing obvious magnetodielectric effect.These results indicate that the introduction of Cr^(2+)ionsasthe building blocks of crystal structure is feasible method to synthesize materials with high magnetodielectric coupling effect.

关 键 词：磁电材料 磁介电效应 金属有机框架 多铁性 

分 类 号：TB34[一般工业技术—材料科学与工程]