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崔梦范, 王松伟, 张鑫, 等. Cr3+掺杂对Mn3O4结构、形貌以及磁电性能的影响[J]. 桂林电子科技大学学报, 2024, 44(3): 292-298. DOI: 10.16725/j.1673-808X.2022136
引用本文: 崔梦范, 王松伟, 张鑫, 等. Cr3+掺杂对Mn3O4结构、形貌以及磁电性能的影响[J]. 桂林电子科技大学学报, 2024, 44(3): 292-298. DOI: 10.16725/j.1673-808X.2022136
CUI Mengfan, WANG Songwei, ZHANG Xin, et al. Effects of Cr3+ doping on the structure, morphology, magnetic and dielectric properties of Mn3O4[J]. Journal of Guilin University of Electronic Technology, 2024, 44(3): 292-298. DOI: 10.16725/j.1673-808X.2022136
Citation: CUI Mengfan, WANG Songwei, ZHANG Xin, et al. Effects of Cr3+ doping on the structure, morphology, magnetic and dielectric properties of Mn3O4[J]. Journal of Guilin University of Electronic Technology, 2024, 44(3): 292-298. DOI: 10.16725/j.1673-808X.2022136

Cr3+掺杂对Mn3O4结构、形貌以及磁电性能的影响

Effects of Cr3+ doping on the structure, morphology, magnetic and dielectric properties of Mn3O4

  • 摘要: 为了探究Cr3+掺杂对Mn3O4体系磁电效应的影响,采用传统固相法成功制备了Mn3O4及Mn1.8Cr1.2O4的单相多晶样品。X射线衍射及精修结果表明,掺杂前后存在晶体结构的改变,由四方晶系转变为立方晶系,其空间群由I41/amd变为 \textFd\bar\text3\textm 。场发射扫描电镜结果显示,掺杂前样品的晶粒呈紧密的镶嵌结构,掺杂后样品呈离散的五面体及八面体形貌,且尺寸约是掺杂前的1/8。磁性研究结果表明,掺杂前、后样品Yafet-Kittel型亚铁磁相变温度由43 K提高到60 K,这源自Cr3+掺杂使Mn3+(Cr3+)/ Mn2+—O键长缩短,Mn3+(Cr3+)—O—Mn3+(Cr3+)键角增大,磁相互作用增强。此外,掺杂后矫顽力显著降低,这可根据离散的晶粒间作用力减小来理解。介电效应研究发现,掺杂前、后样品在磁相变点附近存在不随频率移动的介电异常峰,表明该体系存在与磁序相关的铁电极化,这源自体系的非线性磁结构。

     

    Abstract: Mn3O4 and Mn1.8Cr1.2O4 single-phase polycrystalline samples were successfully prepared by the conventional solid-phase method in order to investigate the effect of Cr3+ doping on the magnetoelectric effect of the Mn3O4 system. The results from Rietveld refinement of powder X-ray diffraction patterns show a change in crystal structure after Cr3+ doped Mn3O4, from a tetragonal (space group I41/amd \textI\text4_\text1\text/amd \textI\text4_\text1\text/amd ) to a cubic (space group \textFd\bar\text3\textm ) crystal system. Field emission scanning electron microscopy results indicate that the morphology of Mn3O4 is with a tight mosaic structure, while Mn1.8Cr1.2O4 manifests as discrete pentahedron-like and octahedron-like. Moreover, the grain size of Mn1.8Cr1.2O4 is about 1/8 times of that of the Mn3O4. Magnetization measurements show that the Yafet-Kittel type ferrimagnetic phase transition temperature increases from 43 K to 60 K after Cr3+ doping, which is due to the enhancement of the magnetic interaction from the decrease of the Mn3+(Cr3+)/Mn2+−O bond length and the increase of the Mn3+(Cr3+)−O−Mn3+(Cr3+) bond angle. In addition, the coercivity of Mn1.8Cr1.2O4 decreases significantly, which can be understood in terms of the reduction in force between crystalline grains. The dielectric effect study shows that the dielectric anomaly peaks are observed in Mn3O4 and Mn1.8Cr1.2O4 near the magnetic phase transition temperature, and the dielectric anomaly peak positions don´t shift with frequency, indicating that the systems exist ferroelectric polarization related to the magnetic order, which originates from the nonlinear magnetic structure of the system.

     

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