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正铁酸镝纳米颗粒的合成、结构、介电、电学和磁学表征

Synthesis, Structural, Dielectric, Electrical, and Magnetic Characterization of Dysprosium Orthoferrite Nanoparticles.

作者信息

Yadav Abhinav, Sahoo Sushrisangita, Chin Wai Kiat, Panda Debasish, Adegbite Peace Ikeoluwa, Tamang Binny, Mahbub Rifat, Lai Rebecca Y, Shield Jeffrey E, Choudhary Ram Naresh Prasad, Rangari Vijaya

机构信息

Materials Science and Engineering Department, Tuskegee University, Tuskegee, Alabama 36088, United States.

Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, United States.

出版信息

ACS Omega. 2025 Aug 12;10(33):36931-36945. doi: 10.1021/acsomega.4c10092. eCollection 2025 Aug 26.

DOI:10.1021/acsomega.4c10092
PMID:40893308
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12391926/
Abstract

Single-phase dysprosium orthoferrite (DyFeO: DFO) nanoparticles have been synthesized using the nanoagitator bead mill. Rietveld refinement of the experimental X-ray diffraction (XRD) pattern confirms the orthorhombic crystal symmetry ( space group) of the material. The surface morphology, grain size distribution, and color mapping were analyzed. The size of the DFO nanoparticles was found to be 49.5 nm. Dielectric polarization and relaxation mechanisms over a wide frequency range (1 kHz to 1 MHz) were explained by Maxwell-Wagner and Cole-Cole models. The non-Debye relaxation mechanism by the Cole-Cole model in the frequency-dependent dielectric analysis was again confirmed from the impedance study. The conduction phenomena in DFO are governed by the small polaron hopping mechanism. The DFO nanoparticles system is magnetically frustrated and exhibits a paramagnetic behavior. The spin reorientation from ⟨⟩ axis to ⟨⟩ axis around 25-50 K causes a decrease in magnetization of the sample. The present work unveils many possible opportunities for future studies, i.e., tailored multifunctional properties by site engineering and as a filler material for flexible electronics.

摘要

已使用纳米搅拌珠磨机合成了单相正铁酸镝（DyFeO₃：DFO）纳米颗粒。对实验X射线衍射（XRD）图谱进行的Rietveld精修证实了该材料的正交晶体对称性（空间群）。分析了表面形态、晶粒尺寸分布和颜色映射。发现DFO纳米颗粒的尺寸为49.5纳米。通过麦克斯韦-瓦格纳模型和科尔-科尔模型解释了宽频率范围（1千赫至1兆赫）内的介电极化和弛豫机制。从阻抗研究中再次证实了在频率相关介电分析中科尔-科尔模型的非德拜弛豫机制。DFO中的传导现象由小极化子跳跃机制控制。DFO纳米颗粒系统存在磁阻挫并表现出顺磁行为。在25 - 50 K附近从〈〉轴到〈〉轴的自旋重取向导致样品磁化强度降低。本工作揭示了未来研究的许多可能机会，即通过位点工程定制多功能特性以及作为柔性电子器件的填充材料。

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