Zn掺杂CoFe_(2)O_(4)纳米颗粒的制备及其阳离子占位对磁性的影响  

Preparation and exploration of Zn-doped CoFe_(2)O_(4) nanoparticles of cationic occupation effect magnetic properties

作　　者：邢宏娜 李鑫源 王丹 冯娟 宗妍 李兴华 XING Hongna;LI Xinyuan;WANG Dan;FENG Juan;ZONG Yan;LI Xinghua(School of Physics,Northwest University,Xi′an 710127,Shaanxi,China)

机构地区：[1]西北大学物理学院,陕西西安710127

出　　处：《金属功能材料》2023年第1期32-37,共6页Metallic Functional Materials

基　　金：陕西自然科学研究计划面上项目(2021JM-304);陕西自然科学基础研究计划项目(2021JQ-427)。

摘　　要：钴铁氧体因结构独特、磁晶各向异性和矫顽力高等备受关注。研究表明,在纳米尺度下,钴铁氧体的磁性表现出与组分、尺寸及阳离子占位紧密的依赖关系。采用热解法合成了分散性良好的ZnxCo_(1-x)Fe_(2)O_(4)(0≤x≤0.4)纳米颗粒,测试结果表明Zn^(2+)成功掺杂进入到CoFe_(2)O_(4)中,且颗粒粒径分布在6~8 nm之间,说明Zn^(2+)的掺杂对粒径的影响可忽略。磁性研究表明,随Zn^(2+)掺杂量的增大,样品的饱和磁化强度和净磁矩逐渐减小。这是由于小尺寸效应下Co^(2+)在四面体(A)和八面体(B)位上均有分布,Zn^(2+)引入优先取代A位上的Co^(2+),使部分Co^(2+)从A位迁移到B位,从而B位上的Co^(2+)和Fe3+出现部分反平行排列,主导磁性的A-O-B相互作用减弱所致。研究结果表明,无磁性Zn^(2+)可诱导尖晶石铁氧体的阳离子重分布,从而改变其磁学性能。As spinel ferrites material with unique structure, magnetic anisotropy and high coercivity, cobalt ferrite has attracted much attention. The magnetic properties of cobalt ferrite are dependent on the sample composition, size and cationic occupation closely at the nanoscale. ZnxCo_(1-x)Fe_(2)O_(4)(0≤x≤0.4) nanoparticles with good dispersion were synthesized by pyrolysis method. The test results showed that Zn^(2+)was successfully doped into CoFe_(2)O_(4), and the particle size distributed between 6 and 8 nm, indicating that the Zn^(2+)doping has ignorable influence on the particle size. Magnetic investigations indicate that with the increase of Zn^(2+), the saturation magnetization and net magnetic moment of sample decreased gradually. This is because that under the small size effect, Co^(2+)is distributed at both tetrahedral(A) and octahedral(B) sites, and Zn^(2+)is replace the Co^(2+)at A sites preferentially. Which makes parts of Co^(2+)migrate from the A to B sites to reduce the strain, so that Co^(2+)and Fe3+at the B octahedral sites appear partial anti-parallel arrangement, and the A-O-B magnetic interaction is weakened. The results show that the non-magnetic Zn^(2+)can induce the cation redistribution and control the magnetic properties further of spinel ferrite.

关 键 词：过渡金属掺杂 钴铁氧体 热解法 磁性能 

分 类 号：TB383.1[一般工业技术—材料科学与工程]